I have only read one book more than once. It's a bit like watching a tv programme and thinking " I've seen ìt before". I switch right off.
But recently I've discovered that I can enjoy favourite films or series a second time round. Maybe it's an age thing.
I got rid of my 1000s of paperbacks a few years ago which was liberating and freed up space where bookshelves had been, but now I wonder whether that was a mistake.