I used to be in a 6 piece folk-rock band where 3 of us turned up at every rehearsal and the other 3 used to turn up when they felt like it. They always turned up for gigs though and got paid an equal share. Nobody, apart from me, booked any gigs, but the fiddle player was very quick to moan about the quality of the gigs despite never actually looking for any herself.
I left one band because they were sending me deaf, 2 guitarists each with a Blackstar 200w stack and no idea how to use the master volume control....
I left another because the guitarist said that if someone asked us to play Brown Eyed Girl, we should (I don't do requests)