I could doubt the value of my books as much as many do, except that, as a researcher and very curious person, I do read a lot too, and can clearly see the difference in value between what I do and what others do. I have no doubt that my books have much more value than nearly all others out there, and it wouldn't make sense for me to be an author if I couldn't see that, or if I saw the opposite, as I believe that, if we're not upgrading mankind, we're just making it lost and vulnerable to the claws of ignorance.