I also believe that they game the system....but I've bought and sold a lot of guns over the years to and from private individuals. I'm pretty sure I'm not unique among gun owners.
Admittedly, I've filled out "the form" more than once so they know where at least one gun is.
What is to prevent a gun owner from calling in a tip on their liberal Pain in the A** neighbor and waiting on the feds to SWAT the libs and then be in place behind them to take out the second set of libs and then collect their guns and ammo to arm people on their side, but not paying attention?