Smurf to protect urself u could get a new Steam account and sell all ur games to the new one before u get VAC'd.

@Khaotik RE: Cracked Servers:
I don't know that you can get banned for that. ZM has been no-steam for well over a year, and before that I've been playing on my friend's ZM servers which have been No-Steam like for ever and she hasn't been VAC'd yet either. So unless I get VAC'd at some point in the future (I never hacked and my account never got stolen) I find it highly doubtful that they can let that happen to you.