Gun shows are great for the knowledgeable to acquire the rare or hard to find. For a newbie to try to save a few bucks, gullible to any rip off such as an incomplete set of dies, neither marked nor explained as such, is in my mind false economy. Everyone here who has attended a gun show can attest that, in addition to the ninja's with extensive SF experience spanning 3 decades and five continents, some, not all but some, of the vendors can spread bovine fecal matter with the best. If one knows prices, knows rarity, has some experience and judgement in evaluating what it is that one is looking at, and lastly, if one can afford to completely blow off the price of purchase which fails to live up to expectations, then go gun show shopping.
Bu to suggest that warning newbie that "deals" at a gun show may not be deals, and that newbies are seldom in a position to properly evaluate them surely does not play into the hands of the anti's. Ripping off a newcomer, or B.S'ing a curious guest, filling him with notions that lead to his being ridiculed on forums like this, well, if that turns him off, then you serve the anti's!