CCP introduced Game Time cards that can be purchased with real cash and then sold in game. Player rich in game can play from their in-game profits and casual players who would otherwise fund the farmers get cash from them. CCP keep all the money within their system and have virtually eliminated gold-farmers from their universe, it's not worth their time or the consumers risk when compared to the system they've made available themselves. Granted there's no way for a player to get cash out of the system, but once we start doing that there's going to be alot of Treasuries taking an interest in people with tax-free incomes.