I stopped giving a specific grade on ebay and instead use a narrow grading range, a plus and minus, and supply lots of photos and a description of even the smallest flaws. I once had a picky buyer who purchased about ten low value books and then proceeded to send me pics of one of the books with circles around a few very minor flaws which were, in my opinion, acceptable with the grade given. He ended up using a "not as described" return on half the books, which was total bull, and my only choice was to refund and let him keep the books because I would have lost money on the return shipping. Ironically, in his auctions he basically states that grading is an opinion and if you disagree with his grading, too bad.