I am an actual guest on the server and yet a member on the forum :/, and i too had the problem of guests being very annoying on plug.play.pay so what we did was made guests have limited chat and cannot break blocks, the griefers got bored before they were members and the more determined got banned. i personally think there should be a sign at the end of the notification ones saying 'If you are going to ask the question we just answered, go find a different server or read it again.'