I'm not being pretentious, but when I look at the stuff I buy (and I'm as materialistic as the next person, slightly obsessed with 'design', and attached to a brand like Apple), none of it I've seen in ads.
Advertising uniformly has the effect of pissing me off and can even turn me off brands. And I'm not a unique snowflake, my wife is exactly the same.
I honestly cannot fathom why any intelligent human being would be influenced by something as unsubtle and obvious as advertising.