Some of us maintain that stock exchanges belong in Las Vegas. Now Sweden-based VersusMarket (www.vsmarket.com) has stripped the pretense of rationality from the investment game. With VS, you dont buy; you bet on selected stocks to outperform others on a given trading day. The odds are not good. You have to pick seven of nine winners in VS Matches or win two heats in VS Races to collect. At least in Vegas you get free drinks.