My suggestion is to have a forum based store that allows you to purchase items. I have been on other forum stores that have it. It is a great way to make money for DR and have fun in the process. Best part is users can screw around with each other for fun but users can't screw around with staff, but staff can screw around with regular users. I know there is a plugin for VBulletin for it so there would be very little work for Oops to do.
Some of the items I have seen on other sites:
-Socks
-Name Change
-Birthday Card From an Admin
-Change your name colour
-Change another User's Name
-1 Prevent Temp Ban
-12 Hour Temp Ban*
-24 Hour Temp Ban*
-Buy the website ($1000000000000000000)
All funds are in USD.
*Requires Admin approval, doesn't work on Forum Leaders
Anyway this is just a few examples of things you can find on the store plugin.