You gotta factor in the company went 4 years developing the game not bringing in any new money, and they continue to continue develop more for the game and maintain the game. You also gotta factor in a chunk of that money went to taxes, to Activision, to marketing, and to pay off all the debt that piled up during the 4 years of no new games. On top of all of the other expenses for salaries, servers, and other infrastructure. Not all those sales was pure profit.