CELEBDAQ is a celebrity share-trading game. You can buy and sell 'shares' in listed celebrities. Every week, the shares you own will pay out a dividend, depending on how much press coverage those celebrities received.
Just like in the real world, share prices rise and fall as demand for them changes - so as well as receiving dividends, you can make money by buying low and selling high...
Unfortunately, the financial instruments aren't that advanced, but it is an interesting idea! I wouldn't be surprised if this actually becomes a real market...