It becomes apparent a persons investment will be made obsolete by the next addition or update, your money spent here is good for about 8 weeks on average before a new game feature or update direcly effects your previous purchase is such ways. Notice it says rule the sky, air units are new and OP, money invested on ground now views as not that wise. Basically whatever you spend on is just to pull you now, not keep you later. how they go from the feedback to this is beyond me.