What's the demographic of people who buy Hip Hop today?

I think Kid Cudi, B.O.B., Drake & Lupe Fiasco all suck. I always hear them on the radio except for Lupe Fiasco. I've heard that damn song "Nothing On You" at least 100 times now. I think it's mostly white people between the ages of 13 and 30 that buy all this garbage rap. I know for a fact that every race listens to hip hop but it's usually white people that like to actually purchase it.