Another thought, as far as forum addons go. I know years ago, when I ran an SMF forum, there was a shop we had, where we had some rather fun items. Most of them were useless, but they did have a function. For example, our custom titles, required X amount of points, changing your display name, X amount of points, etc. etc. I don't recall how points were given out, but it created a nice economy between all of us, and kept us entertained. Seeing as how a lot of us spend a decent amount of time on here, it might be a fun time-waster for us.