Expansion revenue pays for development of the next dlc or even "free" content. It has to be paid for somewhere. The initial 60 bucks you paid for the game can only be stretched so far. Hell if it meant more content, id pay a subscription fee. Now with that said, the value on what we have paid vs what we have been given is a bit disappointing. If the relative amount of content doesn't improve, that could be something that's drives me away from the game. But free content? There is no such thing as "free content". Economic 101.