I really find that hard to believe! There is a lot of money being made by Jayco or now "Thor" supplying parts to these dealers. Big business. Why would Thor care who sells their parts...the more demand, means more supply which in turn means more MONEY, the whole reason for being in business. The more locations selling their parts the better. And Jayco parts will always be in demand as long as the RVs are made.
Haven't checked with the dealers in my area; but then again I wouldn't consider any of them to be a "small business" and their parts depts. are also a big part of the business. I actually don't know any "small dealer" selling Jayco parts.