I too keep all my books, I could never get rid of them! I do like to re-read my favourites. I have never understood people who read a book and then get rid of it saying "But I know what's going to happen, why would I want to read it again?" I find this completely strange! I think I have got rid of about 10 books in my lifetime: they were ones I hated and they went to the charity shop so I could have more room for the books I do like.