I lease buildings to small business people making the leap from their garage/bedroom to having a storefront. I try to explain to them that the money they are making every month that they believe to be profit will disappear once they move to a store. Actually that and more will disappear. They generally do not believe it until the second or third month comes around and rent, utilities and other costs of business come around again.
If business people do not understand the cost of business it is not to surprising that someone selling their train, gun or whatever can't understand why they cannot get retail when selling to a dealer.
