You could also consider Diablo 3 on account of its auction house (once it actually starts working). It's very fascinating to game the market and turn a profit, and I'm sure there's a lot of things outside of videogames to be learnt from using it.
As of now, the auction house is basically the unofficial endgame of Diablo 3.
As of now, the auction house is basically the unofficial endgame of Diablo 3.