There are more bookshelves in my small apartment than any other piece of furniture, and I do go through and take some down to the book exchange to make room for new (hard copy) ones. When my sister died, I was distressed to hear that the second-hand shop owners in her district would not take her massive, broad-range book collection. My family that lived close to her (in another State) decided to tip the remaining books for worms to enjoy.
I sincerely hope that is not the outcome of my book collection when I die.
Recently, I heard my daughter complaining to her aunt over the phone that there were no suitable books for her age group here, "only spiritual books
"). As I was sitting in my armchair, I just moved my left arm down to my side and my hand landed on a great novel for teens called "Runemarks" by Joanne Harris. This book was one of quite a few that I bought for my daughter years in advance of her reaching her upper teens for just the purpose of her enjoying a good story. She is now ensconced in that (finally, one of the four books she has read since puberty).
I often peruse my bookshelves and experience synchronicity in finding a book at just the right time, and a joy in knowing that I have provided the resource intuitively at one moment to be found when needed at another time, this is living the Tao as time-stream flow. I have also consciously collected books that may be needed in paper format if and when technology over-exceeds itself and does a bunk (CME, directed energy outage or whatever). I envision my small home of book-lined walls being a needed resource in that time. For the same reason, I have printed out certain articles from the internet and kept them in Lever-Arch files.