What?! That's frieking retarded. Well what if they discontinue the game. what happens to all that cash. In that case you could invest in game currency o_O. Theoretically game owners could "F" with the market to turn a profit... People do it all the time its called being an insider, but atleast these people don't have complete control over the economy...
Anyway that would make hacking games a federal offense, because it's real damages ur causing.