I have clubs for my vampires, clubs for my EVIL vampires, and clubs for my kids generally - it's usually the easiest way to complete the social aspiration for them, plus then they have friends to grow up with. When Bowling Night Stuff came out I made a club called "Take Them Bowling" and it was all bald sims, but I replaced all the members after I got over the joke. I've had clubs to do a kind of Bachelor thing, if I was looking for a spouse for someone, and clubs for extended families by the score to be able to keep them in touch with each other. Usually I make them up on the spur of the moment for whatever need I have at the time. It's one of my favorite game mechanics though.