So, you are perfectly OK with outlawing face to face sales, even in your own state? Even to your own family?
Yes. The people who know they can't buy a gun or have been denied at a gun store will exploit this ability.
Who does it hurt really? You can still sell your gun privately, you can still buy a gun from a private individual. It just puts the same requirement for them to buy a used gun as it does for me to buy a new gun. The only argument you can make is that it takes a little time, a transfer fee, and a trip to the gun store.
Case in point, I have a friend who's in his late 40's. Until this past weekend, I didn't know he had a mark on his record that prevents him from purchasing a firearm. If he hadn't told me this, I would have had no problem selling him a pistol. I've known him for about 10 years. He's a good guy and whatever mistakes he made in the past, are completely in the past.
This guy is a friend who confided his issue to me. How many strangers are out there that won't tell you that and come off as a straight-liner? A lot! Why not put them through a check? Because it inconveniences you? Since when has gun safety been an inconvenience?
The family question is a difficult one. But personally, my son has asked me "dad, when can I have my own rifle?". My answer is always "when you can purchase one without my consent". Meaning when he can plunk down the cash and pass the background check. I have zero issue putting my own father or brother through a background check for a $25-$35 transfer fee if it means closing that easy and exploitable hole.