I was turned into the AFT by a guy from another website for refusing to sell him a gun. He hit the buy button on it and when he called me he started talking all kinds of crazy that really left me very nervous. I told him I refused to sell him the gun based upon our conversation and he flipped. He called the cs at the other site AND the ATF on me. BTW this guy was a dealer in the North East, and proves background checks will not catch all the mentally deranged. I also had a guy on another forum give me negative feedback because I refused to sell to him for the price he wanted. They have locked my for sale post until the "investigation" is complete. I just logged out and wont return. There are a lot of flakes and nuts out there who will try to run your name in the ground, it's even worse in the car world.
Sounds like you have unfortunately, run into more of your share of nut cases with internet sales. Yours are not the experiences most of us have had.
One nut case example doesn't prove anything doesn't work, including background checks.
You did the right thing by declining to sell to that particular individual if you got a bad feeling from him. If you have nothing to hide (
and I am not suggesting you do), the ATFE will not be bothering you. You
may receive a call from them, and I predict, even so, nothing else will occur. You have broken no federal firearms laws. The only issue you may have is with Gunbroker's administration.
I am sincerely sorry you had these bad experiences. If I had those, nothing anybody else posted here would convince me to continue with internet sales.