I've been outbid (by a huge margin!) on things on eBay that I wanted to share with the world via one of my websites. And after it got too rich for my blood and the auction was over, I have written to some of these guys and said "hey, this would be really useful for the website... could you possibly scan/copy/transcribe/tell me some details about this particular item?" 9 times out of 10 they just blow me off, and don't even bother responding.
Folks, if you've got something cool and historically interesting... share it!! Don't just sit on it.
I know I'm preaching to the converted here, though, because so many of you are involved in preservation projects that benefit the whole world...
--SKot