You play this game with the people you like, but the games you like to play together change and before you know it, you're in a forum clan. Then you find yourself sticking around with the community, possibly even joining other forum clans in the future.
Our clan doesn't care much about this game anymore, so we wouldn't like to let guys down if they want in just because they want to play Toribash with us. We figure they're better off with people who still play the game. Also, you don't necessarily have to be forum active, just be cool. Forum activity helps us know what kind of person you are, though, it's convenient.