Books hold little value if they aren't 1st edtions,1st printings (with an A or 1 on the copyright page) or in leather. Also must be free of remainder marks. Some just aren't worth keeping.
(Denny Crane: "I Don't Want To Socialize With A Pinko Liberal Democrat Commie. Say What You Like About Republicans. We Stick To Our Convictions. Even When We Know We're Dead Wrong.")
If a book is interesting, and not readily available from a large public or university library, it is worth keeping.
I really don't care about the financial value for most of them at all.
"Books hold little value if they aren't 1st edtions,1st printings (with an A or 1 on the copyright page) or in leather. Also must be free of remainder marks. Some just aren't worth keeping."
I must disagree. For me, the value of a book is in the contents of that book. I often buy somewhat damaged copies of old, out-of-print volumes. I read them, then shelve them for future reference.
I do not care about the monetary value of any of my books. It is their contents that hold value, at least for me.
That said, I rarely buy fiction. I obtain my fiction from the library, as needed. I also very rarely reread fiction. There is too much that is new and worth reading, and too much non-fiction to waste time rereading fiction I've already read. When I die, I have no illusions about my library. I'm quite sure it will be consigned to the dump.
You define "value" how? Resale value?
Some of us value the words inside.