Valve has opened up the possibility of users buying and selling virtual goods with money from their Steam accounts, starting out with Team Fortress 2. Players will be able to list their items for up to $200, and Steam will take a 15 percent fee of any sale price.

“With over a half million trades made every week, the trading system has been very successful,” Valve’s Tony Paloma said in a statement. “Extending game economies beyond trades and giving players a way to turn gameplay into funds for new items and games is a key component for moving that success forward.”