Eighteen years in, I can tell you the most dangerous moment in a Google Ads account isn't when the numbers look bad. It's when they look great.
Bad numbers get attention. Someone notices, questions get asked, things get fixed. It's the good-looking report — the one full of green arrows and rising percentages — that quietly bleeds money, because nobody thinks to challenge a winner.
Let me show you what I mean.
The metrics that flatter
ROAS, click-through rate, conversion rate, impression share — every one of them can climb while your actual profit falls. A few of the ways that happens:
- Your ROAS looks brilliant because the system has quietly funnelled budget toward people who'd have bought anyway — your own brand-name searches. You're paying to take credit for sales you'd have got for free.
- Your conversion rate is up because "conversion" is counting newsletter sign-ups and contact-form fills, not orders. More conversions, same revenue.
- Your CTR is the best it's ever been on a campaign that's spending £6 to sell £4 of product.
None of these are lies, exactly. They're just answering a different question than the one that matters.
The one number
There's only one metric I genuinely care about, and it's the least glamorous one in the room: money in the till. Profit. Contribution margin. The figure your accountant recognises and your bank balance reflects. Everything else is a proxy, and proxies drift.
When I take over an account, the first conversation isn't about keywords or bids. It's: what does a customer actually make you, after costs? What's a lead really worth once it's been through your sales process? Until we've agreed that, we're optimising toward a target nobody's defined — and you can hit a target like that all day long without making a penny.
Where the AI fits — and where it doesn't
Here's the part people get wrong in 2026. Google's automation is genuinely good. Smart Bidding and Performance Max do things no human could — react to millions of auction signals in real time, never sleep, never get bored. I'm not anti-AI. I'd be daft to be.
But automation optimises toward the goal you give it, relentlessly — including when that goal is subtly wrong. Tell it to maximise conversions and it'll happily maximise cheap, low-value ones. Feed it a flattering ROAS target and it'll protect that number by leaning on the easy, already-warm audiences you didn't need to pay for in the first place. The machine isn't lying. It's doing exactly what you asked. The whole job is making sure what you asked for is what you actually want.
That's the bit that needs a human who's watched it go wrong a few hundred times. AI plus an analyst beats AI alone — not because the analyst bids better than the machine, but because the analyst asks the better question.
Three things to check this week
If you want to sanity-check your own account, start here:
- Split brand from non-brand. Look at performance with your own brand-name searches stripped out. If the account only works with brand in the mix, you're paying for sales you already had.
- Audit what a "conversion" actually is. Open your conversion actions and ask what each one is really worth. If a £2 newsletter sign-up and a £2,000 order both count as "1 conversion," your optimisation is flying blind.
- Believe the bank, not the platform. Google reports the conversions it can see. Your bank account reports the ones that paid. Where those two stories disagree, trust the bank.
The point
A tidy dashboard is not the same as a profitable account. Sometimes it's the opposite — the tidiness is the problem, because it stops anyone looking underneath.
If your Google Ads reports look great but the growth isn't showing up where it counts, that gap is usually where the money's hiding. It's also, as it happens, my favourite thing to go and find.
Russell Anson runs Compulsion, an independent paid-search consultancy. Eighteen years in, pointed at the only metric that matters. compulsion.agency