In games such as World of Warcraft, accounts do indeed get banned but the amount i feel can vary. Normally you would get commonly china/korea people that would farm gold which is the currencie in WOW and sell it online fo real cash. To stop this from continuing to happen,recentrly World of Warcraft have set, a feature that will limit countries in the korea/china region on how long they can play before they have a break for the game. The farming site will have plenty of people to play and farm, as the labour is cheap. This means they cannnot play 24/7 as they normally would. In WOW they can make serious amount of money quickly, think of all the servers they can accomidate: -American -EU Those two alone are money spinners.