Never get rid of books. I got rid of a lot of mine and thoroughly regret it. Why?
I now have children who want to read them.
I now have children who want to read them.
Having one less book shelf is effectively saving enough per year that you could probably pay for buying back all the books you'd ever re-read on that shelf. And if you ever move, the cost and annoyance of keeping books just skyrockets.
I have a lot of books I love, but 90% of books are essentially disposable vehicles for information of transient value.
Also, for text-only, transient stuff like business books and history books (that I'm unlikely to read twice), I buy a lot of Kindle stuff now.