well, if you're going to make it so greyed out factories don't count for centrals then i might as well tell you that I've found a glitch using them.
you see how the factory's work is if they cant place a coin then it gets stored in itself so when it can it sends all the built up coins at once then because it goes in order of - normal - built up - normal when it works again. what i was doing it sending the first normal then stopping it again and the central thinks the next amount is the correct one so it starts producing the bigger number. (hope that makes sense.)