Sometimes, I think we object to using the law because we don't want to be viewed as going to bed with the opposition.
Anyone who is at several gun shows, selling, um, privately, is in the business of dealing firearms and should be as legal as any other FFL. That's to say, lawful as the rest of us.
Ken, this appears to me that this is a perfect example of why folks should call the BATF. Failure to do so, invites more of this gun show loophole crapola.