If you're half-serious about gaming (and we all are), you know of Steam, the gaming network from Valve. Steam allows for buying games on-line, sometimes with great discounts, and is used by millions of players worldwide. They now are adding the ability to buy in-game items, as reported by The Verge: Source: http://www.theverge.com/2012/12/12/3761090/steam-community-market-open-team-fortress-2 For those of you who do not know, EntropiaPlanets has been offering Steam integration for quite some time now. At this very moment, the steam profile is disabled, but I intend to get that sorted out pretty soon.
I wish entropia would integrate with steam... I already added It as a non-steam game and use steam to capture screenshots.