I actually think your number makes sense -- but I'll go very slightly over maybe $350,000.
I note that there are about 25 PSA 9s and 3 PSA 10s -- both are high for this set. And it means that "better" ones are out there. Also, Koufax is one of the oldest living HOFers (Mays is now the oldest) ... I'm not sure how this factors into it but it certainly could. His career ended in 1966 -- a long long time ago. Mays' ended in 1973 (after Koufax was elected to the HOF)....Pretty sure there is no one alive who was elected before Koufax....
Without violating the OPs last paragraph I don't think that a card this high end can provide fair measure of the "health of the hobby" (whatever that means)... The hobby is not ultimately who "can say the highest number" (to quote Logan Roy out of context) on the highest end of a high end card....
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