...instead of ending private party sales, they should just end
non-FFL's from being able to rent a booth there and sell guns...problem
solved..
1) I'm not advocating that we end private party sales. and 2) what you propose is more of an infringement on free commerce of private property.
We need to find a way to ensure that each gun sold at a show is sold to someone who we know isn't a felon. It's a huge black eye on the gun community, and the BGs have figured out how to game the system.