Campaigns Are Optimised for Sign-Ups or Form Fills, Not Revenue Events
Google and Meta optimise toward whatever conversion action you give them. If that action is a sign-up, a free trial start, or a form submission, they will find the cheapest audience that performs that action. In US SaaS and B2B markets, that audience frequently overlaps with SMBs below your target deal size, job titles that cannot approve a purchase, or users whose use case does not match your core product. The platform is performing correctly. The optimisation signal is wrong.