I hate to be Buzz Killington here, but using rep system for any kind of games or social experiments is a bad thing. Reputation should only be given when someone earns it, not when it's part of a game. This means all topics that encourage rep giving to people who hasn't really deserve it, like me starting a "I give you rep, you give me rep" topic.
If you want to test this thing out, please use something other than rep. Thanks.