I went to this show last year and, like most gun shows, it was filled with dodgy dealers, thieves-in-training, and hustlers. I had an unfired 1978 6" nickel-plated Python with original cardboard box, styrofoam liner and papers that I wanted to sell. I watched one fellow wwith two tables and a nice collection of Colt's sell an identical Python, possibly also unfired, without box, for $4,000 (my going into it price for mine was $3,600 so I felt my number was valid). I approached him and asked if he was interested in mine...he offered me $1,750. When I questioned this, he told me that he was a dealer and only bought at wholesale. He was pleasant enough but clearly only interested in buying cheap. This was repeated, with minor variations in hustler impressions of "wholesale price", by more than fifteen sellers with tables of Colt's revolvers.
I have also attended the Tanner Gun Shows in Denver a few times and found most of the tables populated by hustlers, liars, and thieves. As an example, one goofus peddling M1 Garands, claimed a rifle in an unmarked, seemingly new, wood stock with non-matching handguards, with a Winchester receiver, a 1951 Springfield Armory barrel and a Springfield bolt was a "CMP Correct, Collector Grade". He wanted just under $3,000 for it. He had a potential buyer lapping it up who left to ask his wife for permission to buy it. Many other sellers were misrepresenting their guns or selling questionable goods at ridiculous prices.
My conclusion...if you go to gun shows, you'd better really know guns, have access to "Blue Book of Gun Values" on-line on your mobile device, have specific guns in mind when you go, and believe next to nothing of what sellers tell you. The biggest problem is not being able to fully check the operating condition of guns and, for guns like Milsurps, for parts you can't see on casual inspection. I have worked in the used gun department of a major retailer and also have some collecting and gunsmithing experience so I feel at least minimally qualified to inspect and evaluate guns. I also have an excellent relationship with two superb gunsmiths I can ask for advice and inspections when I need them. I no longer waste my time going to gun shows.
PS-I sold my Python in January for $3,100 in a private sale through a LGS with which I often do business to get a fully legal transfer with CBI and NICS background checks for the buyer. This was a nice deal for both me and the buyer, the definition of a good deal.