Here’s an article on the top book price realized at auction in 2010, topped by a first edition of the legendary Audobon Birds of America, which pulled in an astounding $11,321,215, or four times the price realized for the Shakespeare First Folio that came in at fifth place at a measly $2,315,273.
Not a lot of books of particular genre interest, but there is an inscribed first of A Christmas Carol, and I’m sure that Howard Waldrop will find this copy of The Book of John Mandaville, the most complete version in Middle English known, and which sold for $447,282, of interest.
And here’s the entire list in spreadsheet format for the hardcore.
Edited to Add: Top link should work now, though you’ll have to click on the article link there.
Edited to Add 2: Link now even more cromulent, thanks to the sleuthing of SF Signal’s John DeNardo.