I used to buy anything and everything Bat-related, until it got to cost too much, and I wasn't satisfied with the writing or art, either.
I pretty much buy anything Alan Moore writes, which means I pick up the entire ABC line, but I wouldn't pick it up if anyone else took over writing it, unless it was James Robinson or someone like that.
Some characters appear so infrequently that it's not a problem keeping up with all of their appearances, but generally speaking I'd rather pick up a book because the writer and artist team kicks ass rather than because it's a character I like.
