I do re-read books, although not as much as I used to.
Sometimes I’ll re-read a book because I enjoyed it so much the first time. This is often because I found myself so engaged in an uncommon plot point (for example, Gabrielle Meyer’s Timeless series, which I mentioned last week).
Sometimes I’ll re-read a review copy because I don’t write the review immediately, so have to re-read part of the book to remind myself what to write.
Very occasionally, I will accidentally re-read a book because I forgot reading it the first time.
And while I used to re-read my favourite books regularly, I don’t do that nearly as much as I used to.