| I can only offer you my opinion by observation on this question. You have to remember that oftentimes books are popular in a certain area of this country. I got to Minnesota and no one had ever heard of the St. Jacome's book unless he was a transplant from the east coast.
The Iron's book is one I don't have any experience with but have heard people from outside the east coast refer to it. It has an unfortunately ironic name, in my opinion, for a book about flexibility.
Certainly, the Schlossberg is a universal one and the Colin only slightly less so. Popularity is an indicator of how good a book is and it's also an indicator of how successful a marketer the author/publisher is. So, you might have some superb books that aren't popular for any number of reasons.
ML |