I read a lot. This year it will be 77 or 78 books, depending on whether I finish my current book before the new year; I read the complete Discworld series this year.
I also measure the books that I read with a caliper, so I know how much shelf space they consume. This year it'll be at least 107% percent of my height (6 feet even); last year it was 75 books and 110% of my height.
I put a list of everything I read online: http://reidster.net/logs/book.html. (No RSS on that; sorry.)
Currently, I get nearly everything I read from the library. But if I were rich, I would just buy the books, because I'm a pack rat, I love books, and libraries have limited collections, so frequently there's a lot of messing around to get certain books.
So, I looked up the prices of all the books I've read this year on Amazon, to see what the damage would be. I chose new and hardcover, when possible. The total? $1,313.93, not including shipping.
I would buy them from a local bookstore, not Amazon. So maybe it would be $2000. Still, that's less than I thought. Hmmm.