On the things founders don't have time to figure out themselves.
You're paying for clicks and watching them leave. Eight times out of ten, the ads are fine. The site is the problem.
Agencies love to be vague about this. Here's the honest breakdown of where the money goes and what you should expect for it.
Most sites look good and sell badly. The gap isn't design taste. It's whether the site was built to make a decision easy.