I think a fair amount of them are there because they are considered "it" right now.
The majority of the Artists & Entertainment section are current folks and while they may have effects on culture now I doubt many of them will be around in the long run. Stephen Colbert, Tyra Banks, and the Dixie Chicks? No offense against them but I don't consider them viable people to change our world one way or the other in the long run.
"If you can't delight in the misery of others then you don't deserve to be a college football fan."