We used to do this if users messed with avatars. But simply said, if they behave bad, I don't really care where they misbehave, they get kicked out entirely.

So posts, pm's, profile, ddos-attacks, smacking me in the face or a bomb in my car, if they misbehave, ultimately they have to play somewhere else. I don't like just taking one part away.

[Linked Image from siemons.org]