That 25% of the dealers at gun shows are unlicensed, and we must license these purveyors of books, tools, knives, clothing, artwork, candy and historical artifacts. Ah yes, the "gun show loophole", which says one doesn't need a gun license (FFL) to be a dealer at a gun show if one isn't actually selling guns.
Actually, you can sell guns at a gun show unlicensed (except in Maryland, as far as I know).