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T206Collector1) VCP includes the "juice".
2) A transaction that occurs between two individuals either at a card show or on this B/S/T thread is IRRELEVANT for determining card values because the market never had a chance to weigh in on the price.
If I sell a Ty Cobb T206 for $10 or even $50 through the B/S/T, why on earth should that factor into the value of a T206 Cobb? However, if that card is open for bidding to the public at large and only nets $50, well then you have a realistic value for that card -- you have some idea what people generally are willing to pay for that particular card, which is, of course, what a price guide should be.
Some dude's opinion based on loads of undisclosed evidence and theory and then put into print on an annual basis sounds like the opposite of a good idea for determining a card's value.