Capote's Oscar-led Recovery

Since seeing the wonderful film Capote, I have borrowed a first-edition copy of Truman Capote's In Cold Blood to read, at last, the result of his manipulative intimacy with his murderer subjects. It's a pleasure to hold the collapsing hardcover, printed by Hamish Hamilton in 1966 when the author was still tippling his way around New York. So I assumed such copies would be highly valued.