I would suggest seeing if you can use something like a Kid Proofing site to block your own access to RPGuild.  Or change your password to something long and random so you will forget it.

If you want back in later you can ask to have it reset.

If you don't, don't.

You could even make it clear you want to have to go to Mahz to get reinstated.  This will ensure that even if you decide you want back in tomorrow it will probably be six months before he sees your message and reinstates you.  Get it.  It's a joke.  I'm a funny guy.