A few weeks back Vice had an interesting story about Valve, a game maker, putting an end to trade in various in-game items because "worldwide fraud networks" had been using these items to "liquidate" their gains. You can see the blog post from Valve here : "Why make this change? In the past, most key trades we observed were between legitimate customers. However, worldwide fraud networks have recently shifted to using CS:GO keys to liquidate their gains. At this point, nearly all key purchases that end up being traded or sold on the marketplace are believed to be fraud-sourced." Having not played a video game since the original Super Mario Bros, this all sounded all very strange to me. But I couldn't resist digging a little deeper. After all, strange media-of-exchange are a major theme here on the Moneyness blog. Let's set the stage. Anyone who plays Valve games can access something called the Steam Community Market . Players can go to this market ...