This is an idea to cut down on the spam from members that were previously banned but make duplicate accounts. When you get banned and try to log in, you see a banned message and a message from a super if they choose to add one. The point being you can still see the forum software. Since we don't really need the last word for someone that has been permanently removed from the community, why not just replace the ban screen with a 504 error screen? 504's aren't entirely uncommon here, and may make the user think the site is down until they get bored and do something else.