Those who don't bother reading the "important information about the forum" message provided at signup, aren't going to bother reading any of those other sources you mention either.  They'll either figure it out, or they will go away.  If they are too oblivious to see the message provided in the signup screen AND too distracted to see the topic pinned to the top of the Newbie Forum AND to lazy to try figuring out where they can post, then they probably weren't going to ever contribute much of value anyhow.