That only works if people are using the same search term AND looking for exactly the same thing... If they're looking for different search things but using the

That only works if people are using the same search term AND looking for exactly the same thing... If they're looking for different search things but using the same search terms (i.e. some people are using sub-optimal search terms), that's just going to add effective random noise to the ratings. Given how location-aware some things sometimes need to be (including spellings / alternative words, which in my experience, Google is a lot better at than DDG), I don't see how that works at all.