[yk]

Great, I learn by being misunderstood :) I did think about people who stop playing because of outside events, like a new season of "Game of thrones" or a girl, not about ingame events.

However, there is of course a fundamental bias in game economies. Another example would be, that in game economies people use unethical tactics, like simply killing competition. ( I did not hear of Bing-hordes raiding the Google HQ.)