A friend of mine let me borrow Dune 1-3. I loved them and felt I would definitely re-read Dune. When the deluxe box set of 1-3 came out I bought it but it is just sitting on my shelf. I do plan on rereading them but probably not for awhile. Sometimes I also just like having the books I’ve read on my shelf as “trophies”.
If I really love a book, totally. I’ve bought two this year that I’d previously read from the library.
Usually it’s the other way for me - I’ll borrow an ebook of a book I own so I can get it read quicker, lol.