I've seen a lot of these dealers charging high prices. Bottem line is that they are in business. When you figure what it cost him to pay a vendor fee, haul all of his merchandise to the event, and all otehr associated cost, they haeve to make a good profit, or they could not even think of going.
Just because their prices are high does not make them a dishonest dealer. There is no MSRP on an old bow. It is what the traffic will bear.
Most guys attending these things have a general idea of what a bow is worth. They can choose to pay the price, or walk away.
If I sell a bow to one of them for $50.00, I do not expect to walk past their booth and see it with a price tag of $60.00 on it. I would expect to see the price at least doubled.
I guarantee you that when you got to any retail store they have a 100% markup on their merchandise. IF not they could not stay in business.
Just my thoughts.