Understand what you're saying, Miqque. I have no interest in their private lives at all. I don't care who lives where or who's married to whom, or who hates whom, it's not my business. Even the (tiny) number of professional musicians I am on speaking terms with, I don't know anything at all about their private lives.
But following band break ups, musician changes, etc., -- yes, absolutely yes. I heard a singer I liked with the APP, and if I hadn't looked up who it was and saw what else he had done, hadn't found the history of his old band with Rod Argent (the Zombies) and how they split and what they did next, I wouldn't be sitting here writing about about my Argent CDs now. In the rock world (I don't know about other genres), there is so much movement between bands that it's almost essential to follow that to keep finding new music. Who the hell cares whether Ritchie Blackmore hates David Coverdale or vice versa, or who threw the palte of spaghetti over whom, what's important is that you need to know Blackmore quit Deep Purple otherwise you would never have any reason to check out a new band called "Rainbow"...
Did you ever hear of a guy called Pete Frame? He creates family trees of rock bands, and I absolutely love them:
Isn't that just the coolest thing you've ever seen?