They charge whatever they think they can get away with, whether or not they understand what the book represents. In the numerous used bookstores around here, any how-to photo manual like the above would probably fetch a buck or two. A friend of mine recently showed me a gorgeous full-color
quad-tone folio book that sold for two hundred bucks originally. It was still in mint condition, yet he
picked it up for three dollars. A specialty rare photo book dealer might have asked six hundred for the same thing. When the web functions as a search engine for books, it changes the equation, but one never knows in what direction until they try.