Because the ads someone wants to see, like movie trailers or new products of interest to them, you go looking for yourself. The big tech and media conferences a

Because the ads someone wants to see, like movie trailers or new products of interest to them, you go looking for yourself. The big tech and media conferences are viewed by a ton of people completely voluntarialy. The "value" of advertising next to things you are seeking out, is showing you things you don't have an active interest in seeing.