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identify7Most Importrant = something has to be most expensive and the t206 Wagner protects the hobby's rarest and more treasured cards from the deep pocketed collector wannabees.
Also the 1952 Mantle serves the same purpose - protecting the actual Mantle rookie from the somewhat less deep pocketed wannabees.
Throw in a pile of Playball DiMaggio's and some Goudey Ruths for the more relentless of them - and our collecting is secure. All at the cost of some very common and relatively common cards.
These sacrificial cards are what is important to our hobby.