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Marc S.one of the last population two PSA 8 T206 cards sold for less than $3k. In fact, I can find multiple examples of PSA 8 population two T-206 cards selling for less than $3k, some as recently as within the last six months.
That these have been listed at a nearly 70% premium to the final realized price of other population two PSA 8 T-206 cards -- that reflects to me that these are not true "values". I think there is enough relevant market data to sort thorugh what has happened in the past to come up with a reasonable estimation for what low pop. high-grade T-206 commons are worth.
Yes -- there are a few isolated incidences of higher realized prices for some of the T-206 PSA 8 commons. Most of those are isolated to a) tougher backs, b) Memory Lane auctions or c) other miscellaneous factors.
There was even a minor leaguer T-206 PSA 8 Pop 2 common to sell in Goodwin's May auction that went for a scant $2,155-. What is the world coming to 
Marc