The three questions any paid account has to answer
Who is this actually reaching? Not the audience you selected. The searches and placements it genuinely matched. The search terms report is the most useful screen in Google Ads and the least often opened.
What happens after the click? The landing page is half the conversion rate and it sits outside the ad account, which is exactly why it gets ignored. No campaign outperforms the page it points at.
What is the account being told to optimise for? Smart bidding does precisely what you ask. If a form start counts as a conversion, you will get a great many form starts.
Answer those three and the platform is on your side. Leave any one of them and it is spending your money against you, efficiently.
Why cost per lead usually falls before spend rises
The instinct when leads are expensive is to raise the budget. In a neglected account the opposite works better.
There is nearly always a set of searches, placements or audiences that have never converted and never will, and they consume real money every day. Cutting those first does two things at once. It lowers cost per lead immediately, and it gives the bidding algorithm cleaner data to learn from, which lowers it again over the following weeks.
One Meta account measured here shows the shape of it: 2,631 leads at £2.68 each on average, with the best-performing ad set reaching £0.77 per lead. Another moved cost per add-to-cart from £25.67 to £1.33 across 1,181 add-to-carts. Those are not bidding tricks. They are what happens when the wrong audiences stop getting the budget.
Only after that is there a case for spending more.
Google Ads, including search, shopping and Performance Max where the account supports it. Microsoft Ads where the audience is there, which in some B2B and older demographics it genuinely is. Meta, meaning Facebook and Instagram. Paid social beyond Meta where the case is made rather than by default.
Not programmatic display, not TikTok, not out-of-home. That is not a judgement on any of them. Buying a channel occasionally is how a client pays for somebody else’s lesson.
Where the line is
No account runs here without conversion tracking that can be trusted. Cost per conversion is never reported as though it were cost per customer. And no cost per lead gets quoted before the account has been seen, because the honest answer depends on your market and your page, and a number invented on a sales call is a number invented on a sales call.
If the question is only about search, Google Ads covers when that platform is the right answer and what a click costs in your category. This is the page for buying across more than one platform, and for the decision about how a single budget gets split between them.
Buy customers, not clicks. Everything else on the invoice is a detail.