Some readers of running books are runners (first) who like to read.
Other readers of running books are readers (first) who like to run.
This explains most of the stuff above. It explains why friends of mine who are competitive runners thought the Paula Radcliffe book was "brilliant", while I found it horribly tedious. It also explains why I found Julie Welch's book on the London Marathon, "26.2", the best running book I've ever read, while those same competitive running mates found it "basic" and "boring".
I liked Feet In The Clouds because it did for me what all good books do. It took me out of myself and transported me somewhere else, and allowed me to peer into something that's normally invisible to me. It doesn't matter that I don't do fell-running; it doesn't matter that I'm not a northerner. It was an insight into something beyond my normal experience, and for me, that isn't a reason to dislike the book, it's a reason to cherish it.
Maybe it's BECAUSE I've never run a fell race, and would never even consider doing the Bob Graham Round, that I'm interested in reading why it's a big deal for others.