Because many small transactions create a different social environment/feel. If everytime I want to do something...I have to think, ok I guess I'll spend another quarter...that impacts my enjoyment of the game. It's like Netflix Watch Now vs Comcast On Demand. With Comcast On Demand you have to evaluate the individual enjoyment of eatch movie/show against the requested price. With Netflix Watch Now you can just enjoy the service and not think about it. That is how I want this game to be.