If I understand what your saying, if someone spoofs your name, acts badly, later you may pay for it.
This, i've never seen to be a problem. It's obvious that someone is acting differently, and a quick host check online will confirm it.
Just so you know- 'not a problem' doesn't mean it doesn't happen. If someone spoofs jits' name, and says "OMFG I R T3H merryZORZLOLOLOL!!11" I won't believe it. No one will. It happened, but it wasn't a problem. Just clearing that up.