"I think this is the most stupidest thing I have ever heard" "If you are not staff and making a leaving topic, you are an attention *****" Those things both point in the same direction. You ARE looking for attention, because no-one cares if you are leaving or not. Just hit the little log out button son without all the drama.
Look I'm sorry to see you go, but a Ban? Even though I don't want you to go, if its that important to you, Just click the log out button and never log back in. Its as simple as that. I'm expecting to see you never leaving so it doesn't really matter.