IMO the rapid rise in value is most likely a collector with deep pockets has decided to work on a T-206 Master Set, when this person is bidding all out for every tough back, they all start to go up crazy but in time as they have more and more of the mid backs they will go down but if they are going all out for every drum and uzit that hits the market, prices on the hardest ones might not go down for a long, long time, or really till the day the collection sells or they stop buying.
As a back collector in M101-4/5's if one whale collector decided to buy every Gimbels, HtH, Everybodys, etc and work on a master set of all backs of all players, because these sets only have like 0-2 copies of each card the prices would rise fast and stay there. In effect all the type, team and player collectors would be locked out and would drive the market up pretty fast. If I can't get a Mall Theater for $500 then next time ill bid $600, that doesn't work then the next time $650 and so on until a dupe shows up if never they just keep going up.
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