Maybe he just didn’t want to charge for an interview, as book publication is a different beast than an interview. Writing books easily takes more time than preparing for an interview, at least normally speaking. I’ve never written a book, so I don’t know really about that process. But I would suspect a 30:00 - 1:00:00 interview is not as hard as writing a 200+ page book. So I can see why someone would want to charge for books, but not care to exchange money for an interview. They aren’t the same type of work, and the labor intensity can easily be far greater for writing a book, you know what I mean? He may be everything you think he is, but I couldn’t draw that conclusion just from this response.