All things being equal (money, space, etc), would you rather own copies of the books you read? Or borrow them?
I’m assuming I have a TARDIS-like home here where I can have infinite rooms and corridors full of books…LOL.
That said, I still prefer to borrow for the most part. A lot of times, I’ll see a review or hear about a book and think, “That sounds interesting, I’d like to read that” and then I get it home and find it’s not quite my cup of tea. In that case, I’m not as disappointed if I didn’t buy it but only lost the time I invested in reading it. And I can then put the book back into circulation for someone else to read and potentially enjoy.
I do have some authors and series that I want to have on my shelf. Some favorites I enjoy owning and displaying after I’m done reading them.