Maintaining games is not expensive. Its the corporate bureaucracies that evolve around them that gets expensive. How many times have you learned that cool games are made by a single person? Yet CCP has almost 200 people working for them and the game gets nowhere.
Case in point this thread where an official responded and was like “this is good feedback we have a whole team working on it” but there has been no update for over a month even tho several simple and effective suggestions have been made.