Rabbi,
It may just be me, but where there are many crimes, I think the lion's share of the attention, manpower and funding for enforcement should be concentrated on the most harmful of the crimes.
Paperwork violations and selling without a license are among the least harmful of gun crimes. I'd prefer (whichever side of the gun shop counter I stand on) that the ATF concentrate on guns used in violent crimes rather than wasting manpower on finding out who sold an arbitrary "too many" guns or who forgot to dot their i's and cross their t's on some paperwork.
But that's just me.