First lets keep in mind Simon's comment from page 216:
"To survive the occult journey, one must be prepeared to abandon one's ego; unfortunately for most occultists their ego is the last thing they are prepared to give up."
The book goes on to describe his comparable appearance to Johnny Depp, how Roman Polanski made "The Ninth Gate" based on their story(As someone else already brought up, the movie is based on the book "The Club Dumas" by Arturo Reverte. Don't believe me just look up the book, we are on Amazon after all!) There is also a comment below it about how the movie Ghostbusters is based on it as well. No undeserved ego there I assure you!
The book goes on with praise for Aleister Crowley, condemnation for almost any scholar who does not agree with him, chapter 10 is summed up in a nutshell: A person makes a critical comment about the Necronomicon and Simon's response is more or less: "nuh uh you weren't there!"
The book is not especially well written, the events cannot be proven, the supposedly "stolen books" cannot be listed(except for the Necronomicon of course.) The book is simply a poor defense of a hoax, not even really a necessary defense of it, for as long as there are twelve and thirteen year olds who have no idea about the occult or simply wish to screw with their uptight Christian parents, the Necronomicon will continue to sell copies until The Old Ones come home.