The average Google Ads account wastes between 30 and 50 percent of its monthly budget. That is not speculation — it is what you find when you audit a new client account. The waste is almost always structural, not a matter of bad luck or a competitive market.
The three most common structural problems
The first is broad match keywords without strong negative lists. Broad match has its uses, but without a tightly managed negative keyword list, your ads show for searches that share a word with your target but have nothing to do with your offer. A solicitor running ads for "commercial lease review" can end up paying for clicks from people searching for how to break a lease themselves.
The second is a mismatch between ad copy and landing page. Google rewards relevance. When a visitor clicks an ad about a specific service and lands on a generic homepage, two things happen: the Quality Score drops, pushing your cost-per-click up, and the visitor leaves because nothing on the page matches what the ad promised.
The third is running too many campaigns on too small a budget. Each campaign needs enough data for Google's machine learning to optimise effectively. Splitting a £3,000 monthly budget across seven campaigns means most of them never generate enough conversions to learn from. Consolidating into two or three well-funded campaigns almost always improves results.
What to do about it
Start by pulling a search terms report for the last 90 days. Filter for any term that spent more than £50 with zero conversions and add it as a negative keyword. Do this monthly. It is not glamorous, but it is the single fastest way to improve efficiency.
Next, audit your landing pages. Every campaign should point to a page that mirrors the ad's specific offer. If you do not have a dedicated page, a simple one built around the exact search intent will outperform a polished homepage almost every time.
Finally, consolidate campaigns until each one is getting at least 30 conversions a month. Below that threshold, automated bidding strategies like Target CPA are guessing, not optimising.
When Google Ads is not the right answer
If your product or service does not have meaningful search demand — if people do not already know to search for what you offer — Google Ads will not create that demand. Interruption channels like Meta or programmatic display will serve you better. And if your margin per sale is below about £300, the economics of paid search are difficult to make work unless your conversion rate is exceptionally high.