I've dealt with this seller as well; even met him in person when he traveled to the U.S. and bought one of my books. Sat down and had a drink with him and chatted about book collecting in general and S. King in particular. He strikes me as a sincere and straight up guy. My gut feeling is that he's not passing bad sigs intentionally. This would be a case of him being fooled himself and/or a case of inexperience on his part.