they are for when mods / admins give u a warning for doing things against the rules or if you are been rude or stuff like that and for posting in the ban appeal section if it is not related to the ban. "Just to let you know, the staff has a warning point system.. the more warning points, the closer to a forum ban. You don't need to do our jobs for us, we can handle them." - from fang mat
I got a warning point and I don't know why. But since then I've read all the rules so I doubt I'll get another.