@BeerTent Give them a special badge with a picture of a revolving door.
@Sarge034 The difference I see is that those monks were actually sacrificing something. When a poster requests a ban, all that does is close the one account; they can still read all the content, their posts stay up (albeit with a flag) and they can make a new account if they want and nobody knows or cares. The only thing they lose is their badges. It would be like if the Buddhists burned their clothes; sure, now they have to get new clothes if they want to go out in public again, but it cost them almost nothing to make this 'statement' and by doing so it hurts the statement.
@Superbeast: But that's not how they go about it. If you just want to be banned, edit your bio to explain why you're leaving and request a ban in a PM to a mod. If you post anywhere in the forums about how you need a ban, you've turned it from a request to the Escapist to a soapbox to talk to other forumites, with the hope that you can talk for a bit before the mods stumble across your thread and kill it and you. If you want to say goodbye, that's one thing, but requesting a ban in the open forum is just baiting the bear one last time.