Ignoring your false equivalence: If you already want something, then the ads are useless because the entire point of an ad is to manipulate me into buying some

Ignoring your false equivalence: If you already want something, then the ads are useless because the entire point of an ad is to manipulate me into buying something I didn't want to buy. If I want to buy the book already because I am interested in the author's books then the books sell themselves without need for ads.