@Tyyster42, the trading system is a bad idea because some people have 2 or more computers and they could get on one and the other and give a price of 1 coin or whatever. Your other ideas are good though! =D
@Domand, if we were to do as you said then instead of selling guns for half price people would be resetting their skills, perhaps we should only be able to reset our skills 1-3 times to prevent that.