They are many Chinese copies of audio circuits and gear all over the internet. Bryston, Conrad Johnson, Audioquest, Siltech, MBL, Pass, etc. A lot of times the patient has run-out or the company never had one to begin with. To me, trademark infringement is a bigger concern but, of course, do you really think you're buying a brand new Bryston preamp for $400 just because it says "Bryston" on it? I agree EBay should do a better job of policing their website but ultimately it comes down to the manufacturers to aggressively go after these sellers if they feel they have been damaged and it would make economic sense to go after them.