http://www.shacknews.com/article/94371/pay-for-steam-games-using-bitcoins

"Valve reached out to us because they were looking for a fast, international payment method for Steam users in emerging gaming markets in countries like India, China, and Brazil," Desmond explained. "As the internet's universal currency, Bitcoin will allow Steam to easily reach gamers in every market around the world – without the high fees or the risk of chargeback fraud that come with card payments."