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<p>[QUOTE=&quot;Ken Dorney, post: 2919190, member: 76086&quot;]Doug,</p><p><br /></p><p>You have partially already answered your own question, but I can help a bit with the rest.&nbsp; When David was compiling the data for the rework of his references he reached out to most of the active dealers at the time.&nbsp; I was one among others who he asked input from (and yes, it does give my ego a tiny boost to see my name in the introduction of each volume).&nbsp; When the works were in rough form he sent all of us spreadsheets to enter price data for the grade categories (if I remember right there were grades lower than VF but that didnt make the cut in the final draft, but I could be wrong).</p><p><br /></p><p>Based on our own experiences we entered the prices as we knew them to be at the time.&nbsp; Obviously much of this would be based on private sales, auctions, buy or bid, and even simple opinion.&nbsp; It was a lot of work, with many thousands of types to input.</p><p><br /></p><p>While I dont know exactly how he managed the data I would assume he took an average of all the prices to end up with the entries for the books.&nbsp; Now, we can all see the obvious:&nbsp; those prices were a snapshot in time and certainly were outdated before the books even went into print.&nbsp; However, while some authors will not include values for this reason I think he was correct to add them as it gives us insight into not just the rarity of a type but the popularity as well.&nbsp; There are many factors which affect value and in general I think it relevant for likely several generations.</p><p><br /></p><p>I am not going to do the math but I would assume the values are roughly the same comparing the silver to gold issues (though gold has increased exponentially in value since these books were published).&nbsp; That another thread, and I despise math![/QUOTE]</p><p><br /></p>

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