I don't know, I like reading, I like books, and I like owning the books I am reading or have read (especially if I liked them). But I do have many books I haven't (yet) read, or have only partially read (especially textbooks and some biographies). It's a hobby I don't spend as much time on as I'd like.

I have.. hundreds (I mean that literally - not tens, nor thousands; I don't know exactly the number) of books, a small number across a few rooms. Certainly fewer than you. Were I in your house, I might be inclined to ask if, like me, you slightly veer into ~hoarding~ collecting rather than having read them all; perhaps telling yourself you certainly will, as the backlog only grows ever longer, or whether I should feel ashamed because you actually have read them all and it's a much larger hoard.