Problems with Grappling Books

There is nothinng inherently wrong with publishing a book on the subject of grappling, but when the quality of the book is decidedly low, then what purpose does the book serve?

The main problem I have noticed (and this is my own opinion based on what I look for) is that there is far too much emphasis on 'showing' a technique in a series of photographs accompanied by minimal text description.

What is someone going to learn from that?