Someone who has studied marketing may unconsciously evaluate every ad that they see, and after seeing enough examples, gain a strong understanding of what counts as a good ad and what counts as a bad ad.

If anything, this may be a counterexample. Consider Comic Sans: as far as I can tell, most people actually like Comic Sans. But graphic designers hate it, and the technical reasons seem overall less significant than the tribal signal. Or consider OkTrends; they launched a data-driven project to figure out what profile pictures are better, and discovered that many of the profile pictures they thought were terrible were associated with higher success.