I have spent what is probably a frightening amount on photo books, mostly secondhand or remaindered - the most I spent on an individual book was IIRC US$350 for a copy of "Mirrors Messages Manifestations" by Minor White - worth every cent. At the time, this was one of a very few new copies left. Aperture were offering the same book but with an 8x10" bromide by Minor White included for around U$800 - I did not consider this excessive but decided against buying it, thinking I would rather have 5 $100 books than one print. My biggest regret - buying only one copy of David Bailey's "Goodbye Baby and Amen" when I saw them remaindered for £3.50 - now selling for 20 times that, or indeed anything up to $500!
PS: Another one I didn't buy - Helmut Newton's "Sumo", yours for only just over $18,000 - see here:
http://www.langtoninfo.co.uk/showite...sbn=3822863947
I wonder how many have been sold?