There's plenty of musicians who just wanted to be musicians, and weren't really looking for fame and all that. Just because it happened to them doens't mean they wanted it to and are orchestrating it all. I'm pretty sure celebrities also have money problems - why are you thinking about it in almost totally financial terms??
I'm certain you haven't the slightest clue as to what true addiction really entails. Even bringing in the concept of "natural selection". You have no idea how stupid that sounded. Natural selection works on a lower level than choosing to do drugs, not to mention it doesn't really happen with humans any more. Bunch of fuckin idiots.