The pictures are good. The text doesn't need them. As an amateur photographer, based on the sample given, I would buy that book, with or without pictures. The presence or absence of pictures change the tone of the book for me...not in a value way, but in the way I receive it, react to it, experience it, subjectively, but neither way better or worse.
For my mind, it works without the pictures. If I enjoyed the text, as I do with the sample, it may also be that a "scarce good" you could sell at a regular price is the "coffee table book" (pbook) with pictures too?
(EDIT: I didn't think to look further than the sample, to know it was already available. At the current price, buying it was an
easy one-click)
(2nd EDIT: Note, when I say "the pictures are good", I don't mean to be commenting on their own qualities - or I'd spend more time telling you how much I enjoyed them - but rather I think their placement within the text is "good". Just thought I better get that out of the way, so you didn't think I was giving a one-word critique of your photography
)
Cheers,
Marc