That all works until a group of griefers/trollers take up all the tables and sell jack squat, or set their prices to ridiculous levels. They could just idle all day and not get kicked out. Then there will also be all the spammers that try to get you to pay real money for items and resources, that will be annoying as hell. Idea 2 might work though, in fact Xur did something like that but for only 1 hour then never did it again.