I read 205 books in 2010. Of those books, I had read 93 of them at least once before, leaving 112 that I read for the first time. I borrowed 53 of those first-time books, which means I went out and bought, without having read them, 59 books last year. And of those books, I rated 57 of them as being above average on my own little ratings system. Which means that of the 59 books I paid good money for before ever reading them, only 2 were bad guesses on my part.
Conclusion? I should definitely continue to buy books before I’ve read them, because I am really good at it.