Is it legal to sell region 0 HK DVD sets on Ebay?

[Vicious]

No. But ebay does nothing as long as noone complains. If you send a complaint to ebay saying xx seller is selling bootlegs they will get their account suspended. Every once in a while the R1 companies do a sweep and lots of sets are taken of ebay. It has been a while since that happened though.

I don't think Ebay will even listen to a regular user. It has to be the license holder of that particular anime that has to complain. At least that's how it used to be.