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T206Collector...VCP does not even include BIN sales on ebay for the very reason that when a seller gets his asking price on a card it tells you very little about the market for that card, other than there was one person willing to pay that amount on that date for whatever reason.
Again, auction prices for cards is the closest thing we have ever had to real-time valuation of baseball cards. Nothing else comes close.
If Dealer X sells a card to Customer Y for Price Z, how does that help you determine the value of that card? Please try to explain that to me. Why should I care about Dealer X's asking price or that Customer Y cared to pay Price Z for it? Remember, that a final auction price at least tells you what two people, if not more, were willing to pay for an item. Put that on ebay -- an international forum with gobs of collectors looking at the cards every second -- and you are talking about a global marketplace that tells you a zillion more things about values of cards (and other goods, frankly) than your local card show.
BIN's or private sales are much less meaningful and can only be judged as accurate when compared against recent auction sales of the same card.