ebay illegal yes, but they don't do much to stop it. From the complaining I've seen about it in the NintendoAge rant thread for ebay among others that slide by unless someone does some footwork and discovers through the blocked name a bunch of bids that coincide with what you're bidding on there's not much that can be done and they don't care since they get a cut on everything including the shipping which is garbage. Shill bidding works in their favor now since they block bidder IDs, as in the past when they weren't you could see someone doing it, report it, and they'd get booted.