A player in America sold his 70 level character of WOW for 400$. The buyer is a person in china, who will use the high level character to find "GOLD" in the game. Then sell this gold to other players (American possibly) who would use it to buy weapons in game. These Chinese players have are "Gold Farmers". And guess what, what will the player do with 400$ .... he will buy couple of 60 level players in the game .... increase their level to 70 and sell them again for some profit ... now - that's a way to play the game and make money too ... not sure - if it is good or insane.