No more so than it is now. As I and others have stated, it is political theater. Biden will be patting himself on the back for shutting down the nonexistent "gunshow loophole". If it serves anything, it is a warning to those you mentioned selling 5 or 6 different guns a month (or more) and those people already knew they were breaking the law. If anything, that is who they will be going after. I seriously doubt they have the budget or man power to be bothered with many. Only those who are blatant about it."If you have a collection and decide to liquidate it, you are not affected. If you buy a gun and decide you don't like it and sell it, you are not affected."
Is it not probable with the clarity of this new rule that the ATF could bend it to their will and use information gathered from a site like this to build a case? If you buy a gun and don't like it and you paid $350 and its listed here for $400 and some shmuck buys it, you have broken the rules. If you do that once a month and every time there is an electronic example for a year that's 12 offenses. Same logic applies to collections liquidated, if its 30 firearms over the course of a year, you might get a knock at the door. Also, if you bought a Ruger 77 in the 90's for say $700 and you sell it for $ 1300 because collector value went up is that not profit?
You are correct the rule is just verbiage explaining an already existing law, its not new. Maybe I am just another conspiracy theorist but the rule was published for a reason, and I believe that reason is to further track the activity and private sales on sites like this and to build cases, and play the long game, hope I am wrong.
Again, just my opinion and it does not effect me personally. They can walk into my home and inspect my records any time they want. (During business hours).