Supply and Demand is the simple answer. There's more '73 highs and less demand for them than say '52 highs. Much the same as '68 highs aren't as valuable as '67 highs.
Beyond '73 Topps stopped releasing cards in series, so the short print high numbers become extinct.
Last edited by rsdill2; 06-16-2020 at 06:23 PM.
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