Online advertising: pay for sales, not clicks

Online advertising has a flaw that is also its strength: it produces numbers immediately. Impressions, clicks, form fills, a cost per lead. Those numbers reassure, but none of them says whether the campaign made money. Many accounts therefore optimise the wrong thing very well.

This guide opens our Online advertising section. It follows the order of the decisions: where to put the first euro, which network, what budget, how to measure through to the sale, how to keep control of campaigns and of the agency. Each section links to the article that goes deeper. With us, advertising is managed together with search and the CRM, in one piece: that is our digital marketing offer.

Ads or SEO: where should the first euro go?

They are not opposites; they work at different speeds. Paid search brings requests the next day and quickly shows which searches sell. Organic search builds demand that lasts, but takes months. And if the site has flaws, every paid click pays for them too. The decision grid is in SEO or paid search: where to put the first euro. Either way, start by measuring what the site already receives.

Which network: Google, Meta, LinkedIn or Microsoft?

The question is not “where is my audience?” but “is my client already searching for what I sell?”.

For a business that sells locally, the most profitable setting is often the area: a radius around the address, at the hours someone answers. See Local advertising: attracting customers within 20 km. And a new placement appeared in 2026: ads in AI answers, at Google as at ChatGPT, covered in Ads in AI answers.

What budget gives you a signal?

A budget that is too small saves nothing: it does not produce enough requests to know whether the campaign works. The minimum budget is calculated backwards, from the cost of a click and the number of requests needed to judge, then held for at least one sales cycle. The calculation for Google Ads is in Google Ads in B2B: the minimum budget that gives a signal, and for social networks in Social media advertising: what budget, what results.

The same logic applies to testing one ad against another: you need enough clicks for a gap not to be chance, often far more than expected. A small account therefore tests bold differences, as we explain in Testing an ad: how many clicks before concluding.

How do you measure through to the sale?

This is the section that changes the most accounts. The cost per lead shown by the network stops at the form; customer acquisition cost goes to the signature and counts everything: budget, management fees, tools, sales time. The method is in Customer acquisition cost: calculating it through to the sale.

Without that return, the network optimises form fills, including those that never sign. With it, it bids on clients. The walkthrough for Google Ads is in Sending CRM sales back to Google Ads. Measurement, finally, depends on visitor consent in Europe: what Google’s Consent Mode really does is explained in Consent Mode: conversion tracking without jargon, and what remains possible for retargeting in Retargeting without third-party cookies.

How do you keep control of automated campaigns?

Networks push towards campaigns that choose channels, pages and part of the copy on their own. They are effective on what you report to them, and blind to the rest. Keeping control comes down to three habits.

1. Read the search terms every week and exclude what does not sell: it is the fastest saving in any account. See Negative keywords.
2. Know what the automated campaign shows and hides, and what you can forbid it: Performance Max: what the automated campaign hides.
3. Review any generated copy or visual before publishing, then test it against the existing one: Advertising and AI: generated copy and visuals.

And when results disappoint, look at the page before the ad: a slow page that does not repeat the ad’s promise or hides its form turns every extra euro into bounces. See Landing page: the ad is never the only culprit.

What should an agency contract contain?

Handing your campaigns to an agency is often the right call, provided the contract states the essentials: the account belongs to you, with admin access; the agency is paid separately from the budget paid to the network; it reports on a fixed schedule; it is judged on written results; and you can part ways without losing the history. The full list is in Google Ads agency: what a contract must contain.

Where to start

1. 01Measure what exists.

   What the site already receives, from where, and how many requests become clients.

2. 02Pick one network.

   The one that matches your clients’ demand, not all of them at once.

3. 03Set a budget that gives a signal.

   Calculated backwards, held for at least one sales cycle.

4. 04Connect the sales return.

   Click identifier kept, CRM stages sent back to the network.

5. 05Set up a weekly review.

   Search terms, exclusions, landing page.

If you want us to manage it, our digital marketing offer brings together ads, search and CRM, and our programmatic Google Ads campaigns roll out ads by market and by product. For a first question, write to us.

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