Semi-related: a few days ago I took two boxes of old computer and math books to a local Half-Price Book store. They don't usually offer a whole lot of money for such things, and I had been thinking of donating the books to the public library, but the library didn't seem interested in what I had. I figured I might as well get a few dollars rather than just throw them out. As expected, after about ten minutes of sortin…
I spent 4 years working at a second hand bookstore, and I knew that computer books were generally treated as unsellable. Especially old ones.
So I put the box on ebay for $1, with a full list of the books inside. Knowing that this way a wide audience would see them, and presumably I would reach a vintage computer enthusiast who would come, pick them up, and take them away. I wasn't looking to make money, I figured $10 or so would be the price - and a guarantee that the person actually wanted the books.
The box sold for close to $300. The winning bidder was after a ProDOS reference book that I barely realised I even had. I have no idea what the second bidder was after.