Also maybe consider adding the bulleted points from the rules to the forum signup page to better ensure people actually read those points. Because if reading the instructions of this forum is anything like the human nature of reading the instructions for most things then I doubt many actually do once they get signed up (2600+ users, 319 views of rules).
Just make Jo and PrintNinja moderators as they seem to care the most about the forum and are the most involved. Why not let them help police and manage things and put an end to all these related discussions.