Your Google Ads Campaign Is Doing Two Jobs. You're Only Measuring One.

Here's a number that should bother you: the average click-through rate on Google Search Ads is 6.64%.

That means for every 100 people who see your ad, roughly 93 don't click. Most business owners look at that and think "waste." They see 93 missed opportunities. They open their Google Ads dashboard, check their cost per click, check their conversions, and conclude that the only thing that matters is the 7 people who clicked.

They're wrong. And the science of how humans actually form preferences explains why.

Those 93 people who saw your business name, read your headline, and scrolled past? They didn't ignore your ad. Their brains registered it. Filed it. And the next time they encounter your brand, whether on a van, a review site, or a friend's recommendation, something will feel different. They'll feel like they've heard of you. They won't know why. But that feeling of familiarity will tilt their decision in your favour.

Your Google Ads campaign is doing two jobs: generating leads today and building the brand recognition that generates leads next quarter. You're only measuring the first one.

The Science of "I've Heard of Them"

In 1968, psychologist Robert Zajonc published a paper that changed how we understand preference. His experiment was deceptively simple: show people Chinese characters they'd never seen before, some more frequently than others. Then ask which ones they "liked" more.

The result? People consistently preferred the characters they'd seen most often, even though they had no idea what any of them meant. Zajonc called this the mere exposure effect: repeated exposure to something, even without conscious attention, increases preference for it.

This wasn't a small finding. It's been replicated hundreds of times across stimuli including faces, sounds, shapes, words, and brand logos. The effect holds even when people can't consciously remember seeing the stimulus before. Your brain processes the familiar item more easily (psychologists call this processing fluency), interprets that ease as a positive signal, and translates it into preference.

Think about what this means for your advertising.

Every time someone searches "plumber near me" and sees your ad in position two but clicks position one, you haven't lost. You've made a deposit. Their brain has processed your business name, your headline, your location. The next time they see your brand anywhere, processing will be slightly easier. Slightly more pleasant. Slightly more trustworthy.

Now multiply that across hundreds or thousands of impressions per month. The compound effect is significant, even though none of it shows up in your Google Ads conversion column.

Byron Sharp's Framework Explains Why This Matters for Growth

Professor Byron Sharp and the Ehrenberg-Bass Institute have spent decades studying why brands grow. Their conclusion, drawn from data across 130+ brands in 13+ product categories, is that brands grow by being easy to think of (mental availability) and easy to buy (physical availability).

Mental availability isn't the same as awareness. Awareness is binary: have you heard of us? Mental availability is whether your brand comes to mind at the moment someone enters a buying situation. It's the difference between knowing a plumber exists and thinking of that plumber when your hot water system breaks at 6am.

Here's where it gets interesting for SME owners running Google Ads.

Sharp argues that paid search is fundamentally physical availability, not advertising. It catches people who are already at the shelf, already searching, already in-market. But here's what Sharp's framework doesn't fully account for: the impression itself builds mental availability regardless of the click.

Google's own research supports this. In a brand lift study, they found that search ads produced an average 80% lift in top-of-mind awareness. When asked what brand first came to mind for a category keyword, 14.8% of people exposed to search ads named the advertised brand, compared to 8.2% who weren't exposed. That's a 6.6 percentage point increase in unaided brand recall, from people who mostly didn't click.

Your search campaign is building the mental availability Sharp describes, even when it's only "doing" physical availability.

Rory Sutherland's "Costly Signal" Explains the Trust Mechanism

The mere exposure effect explains familiarity. Sharp explains why familiarity drives growth. But neither fully explains why advertising builds trust, even when people don't engage with it.

Rory Sutherland, Vice Chairman of Ogilvy UK, provides the missing piece through what he calls costly signaling theory.

His analogy is memorable: "A flower is simply a weed with an advertising budget." Flowers invest enormous biological energy into colourful petals, scent, and elaborate forms. Why? To signal to pollinators that they're worth visiting. The investment itself is the message.

Sutherland argues advertising works the same way. When a business visibly invests in advertising, consumers unconsciously reason: "They wouldn't spend this much if their product was terrible." The perceived cost of the advertising acts as a proxy for product confidence. It's a trust shortcut.

The Thinkbox "Signalling Success" study tested this with 3,600 UK consumers. When shown identical fictional brand descriptions with different advertising channels, respondents consistently rated brands advertised on TV (the perceived most expensive channel) higher on quality, trustworthiness, financial strength, and popularity. The medium WAS the message.

Now apply this to search ads. When someone searches for "commercial scaffolding hire Adelaide" and sees your ad appearing professionally alongside or above the organic results, they register a costly signal. You are visibly investing in being found. You are present where it matters. That signal of commitment builds trust, whether or not they click.

This is particularly important for SMEs competing against larger businesses. As we've explored in why buyers trust some businesses instantly, trust isn't built through a single interaction. It compounds through repeated signals of presence and commitment. Every impression your Google Ads campaign generates is one of those signals.

The Maths Most Business Owners Get Wrong

Here's how most SME owners evaluate their Google Ads:

They look at $200 per lead and decide whether that's acceptable. If it is, they keep going. If not, they cut the budget.

But this calculation attributes zero value to the other work the campaign did. Let's add the invisible layer:

If even 5% of those 2,800 people later convert through a different channel (a direct Google search, a phone call, a referral where they thought "yeah, I've heard of them"), that's 140 additional brand-influenced interactions per month that never show up as Google Ads conversions.

This is exactly the measurement problem that Sam Tomlinson identifies in his audit framework: 99% of ad account audits fail because they obsess over tactical metrics (CTR, Quality Score, CPC) instead of strategic outcomes. The strategic outcome of your Google Ads campaign includes brand building. Your audit doesn't measure it. So you conclude it doesn't exist.

Les Binet and Peter Field's landmark research across 996 IPA Effectiveness Award campaigns found that the optimal marketing budget split is roughly 60% brand building, 40% sales activation. Brand-building campaigns produce slower but more durable and compounding effects on revenue. Activation campaigns (which is what most SME owners think Google Ads is exclusively doing) produce sharp but short-lived uplift.

The uncomfortable truth: your Google Ads campaign is already doing both. You're paying for brand building whether you intended to or not. The question is whether you'll recognise it and make decisions accordingly.

Why This Changes What You Should Actually Do

Understanding the dual role of your advertising doesn't mean you should stop measuring leads and conversions. Those matter. But it should change three specific decisions:

When lead volume dips, the instinct is to reduce spend. But every impression during a slow month is still building mental availability. When the buying season returns, you'll be the brand buyers think of first, but only if you were present during the months they weren't actively searching. This is what we mean when we say marketing persistence beats brilliance. The compounding effect of consistent presence outperforms sporadic bursts of "optimised" spend.

Most SME owners ignore impression share entirely. But if impressions are building mental availability, then losing impression share means losing brand-building opportunities to competitors. You're not just losing clicks. You're letting a competitor make the familiarity deposit instead of you. The next time that buyer encounters both brands, your competitor will feel more familiar. More trustworthy. More "right."

Broad match keywords and informational search terms often get cut first in budget optimisations because their direct conversion rate is lower. But these are precisely the queries where you reach people earlier in their buying journey, people who will see your brand name multiple times before they're ready to convert. The 95% of buyers who aren't in-market right now will still encounter your brand through these broader terms. When they do enter the market, you'll already feel familiar.

The Brand You've Been Building Without Knowing It

Here's what most business owners miss about their own marketing history.

You've been running Google Ads for two years. Your dashboard shows 400 leads and $72,000 in spend. You calculate $180 per lead and decide whether that was worth it.

But over those two years, your ads generated roughly 100,000 impressions. Your business name appeared in front of 100,000 search results. Each one was a tiny, invisible investment in recognition. Each one made the next phone call slightly more likely. Each one made the prospect who lands on your site slightly more comfortable, because something about your brand already feels familiar.

When a customer says "I found you on Google," they're usually telling a simpler story than what actually happened. They might have seen your ad three times over two months, noticed your Google Business Profile, read a review, seen your van, and then finally clicked your ad when they were ready to buy. The click gets the credit. The dashboard attributes the conversion to that single last touchpoint. But the mere exposure effect tells us the first five encounters did most of the heavy lifting.

Avinash Kaushik, one of the sharpest minds in marketing analytics, argues in his brand marketing framework that trust is often the real bottleneck, not awareness. Most SMEs have decent awareness in their local market. What they lack is the deep familiarity that converts awareness into preference. That familiarity comes from repeated exposure across channels, including the impressions on your Google Ads that nobody clicked.

What This Means for Your Business

Your Google Ads campaign was never just a lead generation machine. It's also a brand-building engine that works through a psychological mechanism discovered in 1968 and validated across decades of marketing science.

The impressions nobody clicked are building the mental availability that Byron Sharp proved drives market share. The visible investment in advertising is sending the costly signals that Rory Sutherland showed build trust. The repeated exposure is creating the processing fluency that Zajonc demonstrated turns familiarity into preference.

None of this appears in your dashboard. All of it is working.

The next time you look at your Google Ads performance and see 93% of impressions resulting in no click, remember: you're not seeing waste. You're seeing the slow, invisible, compounding work of brand building. The work that makes everything else in your marketing more effective.

Your campaign is doing two jobs. Make sure you're valuing both of them.

Further Reading

• Mere Exposure Effect: Familiarity as a Driver of Customer Preference - Comprehensive overview of Zajonc's research and its modern applications
• Signalling Success: How Advertising Signals Brand Quality - Thinkbox study with 3,600 consumers on how advertising channels build trust through costly signaling
• The Long and the Short of It: Binet & Field's Framework Explained - Summary of the IPA effectiveness research behind the 60/40 brand-activation split
• Mental vs Physical Availability: Operational Guide 2026 - Practical application of Byron Sharp's growth framework
• Google Search Ads Lift Brand Awareness - Google's own research showing 80% lift in top-of-mind awareness from search ad exposure