Every book that I have acquired in my 58 years of life I still own, unless it fell apart from too much reading. My will states that until they find new homes any and all money is to be used to support them till they are placed with a book lover before any money is dispersed to human relatives. Not quite but now that I think it, may be time to modify the will!
Before you give away a book, even to a fellow bibliophile check what it is worth, my Dirac’s The Principles of Quantum Mechanics 2nd Edition, is worth about a grand, but what shocked me was when the current gun control debate started again I recalled my favorite book on the subject, Unintended Consequences by John Ross. I was checking Amazon, thinking about submitting a review, I was surprised to see a book I bought back in 98? for $20 or so was now selling for $400 used.
I too have some valuable books, not to be parted with.