It's all a social thing surely. you see what other people do and how others react to it, and that informs your opinions and how you react to others. Also if you try something and observe others reactions, even passively, you'll then continue to do things or not. This would lead to more interaction with / exposure to the thing, and acquired taste kicks in.
So it's a reflection of what other people around you like, and a reflection of the volume of things that are around you, a combination of the two and a bit of special sauce that I haven't figured out yet, but definitely isn't money