They are definitely bootlegs, probably all of them. There's a distinct lack of a publisher or a catalog number on most of them, but you can see one here:
http://cgi.ebay.com/2CD-DANCE-DANCE-...742.m153.l1262
Compare the Obi to the legitimate one:
http://vgmdb.net/db/covers.php?do=view&cover=37872
Ebay has proven that it doesn't care about bootlegs as long as the original publisher doesn't file a complaint.