You can imagine a world where advertising is designed to trick the concierge of course, but at a certain point there's just objective data, e.g. "don't pay more for [x] because it actually comes from the same factor." If something like that could be achieved, what does it do for the ad business generally, and how do companies react?
The fantasy version (though it'd harm me personally) is that companies have to spend more effort competing on price/quality and less on branding. However, because humans signal to each other using clothing, food, cars, etc. you'd still have ads designed to promote status.