whoop writes "Valve has announced that Team Fortress 2 will be getting a new Mann Co. Store to buy trinkets with real money through a service called Steam Wallet. TF2 is the first game to use this new Steam Wallet, but the money can be spent on anything in Steam, including full games. This would open them up to featuring gift cards, micro-transaction games, and more."
PC Gamer has an interview with Valve's Robin Walker about why they're doing this
. Walker says everything they're selling will still be obtainable by playing the game, other than a few cosmetic items.