wow usually the book has to be out of print and the author dead.....unfortunately for the seller and the educated potential buyer book is still in print and the author is still with us...
Similar things have happened with some of my Dads books especially the ones he signed and any of the limited edition leather bound King James Version of the Bibles that he put his charts on Revelation in. They will bring several hundred dollars....my Dads writing was on deeper topics than what I wrote on...plus several of his books topped 1/2 million in sales.....my books still lag behind!