You have a good point there, that I didn't think about Wicka. Some people would obviously join shells just to reap the benefits of their facilities for free, who may/may not put any effort into buying those facilities despite the cost of the rooms/upgrades. Unfortunately it's one of the few problems I cannot think of a solid solution too, without charging a discounted fee like you mentioned. But thankfully things are subjective at this stage and getting all the problems pointed out early will make it easier to counter them in the development process. ^_^