A while back, I launched a site that used a stock trading mechanism to rank posted links and content. It was kind of a speculation market. There was a flurry of activity as a community embraced the game aspect of it, even though no actual money was involved. However, I learned that it’s difficult to manage such a system when many clever people are trying to game it. Eventually pulled the plug as I didn’t make enough time to properly grow it. Still think the concept has merit.