I think for most it comes to ignorance of who values it. I mentioned I have sold items most of my life, but many of the items you find interested buyers for escapes even me. Maybe you could put together a guide explaining how one finds interested parties for parts. I say guide, because I believe you could easily compile in a word document, make a cheap cover (or pay someone on Fiverr, just provide the pic to know there is no copyright violation) and self publish via Kindle, Nook, Kobo etc.

Love these posts.