An examiner article today
http://www.examiner.com/x-1652-Gadgets- ... ty-gadgets noted that a signed hard copy of Stranger would cost about $6000.
How does he know? Is there a "blue book" for Heinlein books? Or letters, etc, which are harder to get?
I have seen a little of Jim's issue with trying to get anything signed by Richard Burton - many people seem to hold onto this stuff because of its very high financial value, so scholars may have trouble accessing it.
Are we seeing this phenomenon with Heinlein as well? Is there even an accepted guideline for this?
Audrey