Now mind you I have been to shows where prominently displayed at the table was "Private sale, cash Only, No Background Check". Sort of a drag when you see the same guy with a table full doing that show after show
You still retain the competitive advantage of obtaining items from distributors while the fellow above is limited to the used market.
If the background check doesn't clear your name while you are at a show, your choices as a buyer have been to wait the three days and locate the FFL holder later, or walk away from the purchase. Not having to check in with the state can be a legitimate convenience for people legally entitled to purchase and possess.