Now that Joe is a site supporter, he can make announcements:
Joe's Automatic Transmissions has taken on a new supplier and can now offer even better deals on building your dynaflow!
Joe could offer specials:
Switch Pitch Converters are 10% off until the end of the month for Team Buick Members!
Bob would be happy to put a lined image of a logo in Joe's signature so that when he has the opportunity to participate on the forums, he would get additional free advertising. In this case, Joe could volunteer to be a moderator in the transmission forum and get notified whenever there is a posting he may be able to help with.
Joe could write short articles or offer tips in his forum to attract guests.