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davidcyclebackAuction realized prices can only be reliable indicators of market price when the auction descriptions are accurate and not deceptive. One reason is that many bidders choose the amount of their bids based directly on what is said in the description.
It's unlikely that anyone here is going to beleive that T206 Ty Cobb reprints are worth $200 each because a fake Cobb sold for $200 in one of those private eBay auctions.