This.And to be honest, even a sticky wont hold them back to post these threads :/
I actualy think that there should be a drop-box or tick-box saying "are you talking about bans?" And if you are then a big message will come up saying "This is not allowed on the forums! Please do not post or your ban will be extended!" I don't know if that's possible, but it would be a good idea to help get rid of those pestly nubs asking to have their ban removed.