the demand is present, and a helluva lot of that was BEFORE there was much of an Internet, gun-forums, etc. With 15 other can books, videos, newsletter, generic gun book, and so on, guaranteed 30-40k a year, EASY money. Lots of free time to expand into other things.
There's a tremendous backlog of demand for 80% finished receivers, and a great need of an effective walking stick. Blind trusts, spare ID's, disguises, etc, with which to open bank accounts, businesses based overseas, and so on, gets REALLY difficult to "follow the money", and there's nothing illegal about it in the first place. 