My bad feeling would be some of the reported issues if you sell to someone on eBay and their Switch gets scratched up by the dock or they have connectivity issues they'll file an eBay money back guarantee on you.It's definitely not worth it on eBay, but you can easily unload it locally for $400 right now.
I am personally keeping the one that was sent to me, but I have a bad feeling about this console overall. I hope I am wrong.