I re-read a book if I truly loved it. I often will re-read a favourite book if I just came out of reading one I couldn't stand, as an antidote
I do almost all of my reading for free. I have a large family to support and cannot afford to misfire on my limited recreation budget. For books that I adore and want to keep, I buy them, but I always use the library for a title I am interested in reading, OR I download the sample chapters. I keep sample chapters of books and tag them accordingly in calibre if it's a book I either want to read or never see again.
I am not a fast reader. My husband tears through books, I take my time.