Internet-only limited player games = Arcade games. They can't be owned. I stopped dumping quarters on this sort of thing in the 80s in favor of the ability to OWN the game.
Where real money is involved, the only way to win is not to play.
miller60 writes "In the wake of eBay's decision to halt auctions of virtual property, new companies are entering the market to fill the void, including one allowing gamers to trade game currency directly with one another rather than buying from IGE or other exchanges. The company, Sparter, says this eBay-like "peer-to-peer" approach will result in lower prices as sellers compete. It incorporates a reputation system and escrow for gold delivery. Sparter received venture funding from Bessemer Capital, signaling that VCs still see opportunity in the virtual economy, even if eBay doesn't."