Beginning today, Nov 1st 2019, anyone wanting to sell used Nintendo products and/or games will require verification through Nintendo first before selling on Amazon. This helps cut down reproduction cartridges, fakes, and 3rd party unlicensed products not verified by Nintendo.
No they won’t ask for a cut despite what half of the internet want’s to debate, and no this isn’t to keep inventory of a product/game; this is to verify what someone is buying is legit Nintendo hardware. Mind you this is also for certain games and parts, not everything.
More information can be found here.
The Royal Assassin 