I never read a biography of Buk... Not sure I want to. I mean, you can know too much, can't ya? Why shatter this nice image I have of him in my mind even if I know it's a fiction? It's not like I'm a scholar trying to get at the "real" Bukowski or something. I'm just a guy who likes how he puts down the lines... Am I missing something good if I don't read this? Curious to hear views...
I personally always try to separate the art from the artist. That being said, if I like the art, I'm probably going to be investigating at least a little about the artist. Sometimes the life of the artist even transcends the art they make for me, for example Dalí, Burroughs and Lemmy. Sometimes the art is much more interesting than the artist, like in the case of most movie directors. Sometimes both are heavily interesting like with Bukowski.
For me it’s sometimes important to research about an artist for the same reason you mentioned you don’t want to know more about them. People usually tend to form this idealized image of an artist in their heads, and I think it's sometimes important to shatter it so as to realize they are humans after all, not some mythical figure we should all be bowing down to. They have values and they have flaws, but in the end, in terms of the art, the work speaks for itself.