Stock Market Hack!
 

This would most likely integrate with the Store Hack. You could customize this based on the content of your site. I'll use wrestling since that's what mine would be.

Basically, posters can use their Gil to buy stock in wrestlers (in the real stock market, these would just be companies). The admin has the ability to add and remove wrestlers, and adjust the value of the stock. Posters then gain or lose money based on the current value of the stock.

It would work for any sports forums (players are stocks), music sites (bands can be stocks), movies, tv, etc.

Why wrestlers? Why not stock in a store item?

This idea would be neat :) but I think the stock value should be changed randomly without our control

Well that could be done if you want to set up a fantasy shop with fantasy items; but it would have to be manually changed with wrestlers/sports players based on their performances.

Anyone?