Why would anyone pay good money for a few tattered pages from a 40-year-old user's manual? Per Gizmodo: "These pages described how to power down the electric systems in the spacecraft, to save energy that was going to be needed during the final approach to Earth." That's right: those pages saved three astronauts' lives and made space exploration history. And in a timely nod to history, the auction will take place on the very day the accident happened 40 years ago.
Personally, I'm holding out for the auction of the gag "invoice" Grumman Aerospace Corporation, the builder of the Lunar Module, issued to North American Rocktwell, which build the Command Module. The invoice charged a whopping $312,421.24 for "towing" the crippled ship most of the way to the moon and back - although there was a 20% "commercial discount," and an additional offer of 2% off if North American paid in cash. Per Wikipedia: "North American politely declined payment, noting that they had ferried Grumman LMs to the moon on three previous occasions with no such reciprocal charges."