The difference between his book and "Gone Girl" or "Fifty Shades of Grey" is that he sold a couple thousand copies in a week and dropped off the radar, while those books are numbers 12 and 9 on the list almost 9 months later. Being a best-seller for a week is a great way to sell a couple thousand copies, but you don't sell hundreds of thousands or millions due to one week at the top caused by some temporary publicity.