This irks me as well, when done in this manner.
Its one thing to, in the listing, say "If you like X brand, this is right up your alley" or "Matches the X brand aesthetic / image"
But I find it very misleading to advertise as X brand, and then hide in the listing "Not actually X brand, just listed it as such for advertising." And its in a TON of listings.
Or listing something as X brand, that isn't X brand. Not giving a disclaimer at all, and ignoring any questions in the comments asking for verification of the brand.
You mean like this listing?? "Balenciaga Boots style CEINTURE ANKLE BOOTS"


http://www.ebay.com/itm/112158052688?ul_noapp=true