... an increased burden over private sales of other goods (and over existing standards for sales of catalytic converters), which quite literally constitutes an "intrusion."
There is quite literally a difference between selling a cat to your friend and selling it to a business that makes money liquidating cats (this sentence is actually humorous if you dont know what cat is short for...).
I have no interest in stopping Joe from selling to Bob, or going on craigslist and selling his wares if he, for some reason, has figured out a way to manufacturer with rare earth metals in his garage. Though I think this is a bit of a stretch of the normal argument. First, because catalytic converters are exceedingly hard to create. Second, because the profit is not in arbitrage but rather theft. Making a catalytic converter is very expensive. There are only a dozen or so companies with the infrastructure to make them at a scale that is profitable. Hence, if we could magically wish away cat theft it would not be remotely profitable to do some kind of rare earth arbitrage by the books. So, ipso facto, it is a good place to enforce at the very least a minimum amount of KYC with associated punishments when third party sales to businesses who do this sort of thing is involved.
I understand the arguments from the other side are the same arguments made for the KYC surrounding the $10,000 withdrawal limit to "stop drug money". I disagree with that kind of KYC. When in 99% cases they are ill gotten gains there must be something done because the alternative is foisting the cost ($300-$XXXX dollars) onto the innocent and throwing your hands up. Worse yet, it's not a one time cost and these criminals, undeterred, will simply return to steal the new one as well. This is no way to treat law abiding citizens.
... an increased burden over private sales of other goods (and over existing standards for sales of catalytic converters), which quite literally constitutes an "intrusion."