[Shenglong]

I don't know what experience you have with online game economies, but saying they've done a good job "managing" their economies is misleading. World of Warcraft has had a good go, not because of any economic management, but because of innovative economic planning... to an extent. The economy in WoW is very artificial, and they've eliminated the majority of their economic issues by releasing new armor sets, and using the bind-on-pickup system.

More so than any other game, I've found arbitrage to be most difficult on WoW.