It goes against econ 101 but sometimes more demand can increase prices even when supply is greater than other products. It's possible more collectors are buying 15 Planks currently or there's just such a small supply of 14's there's been no recent sales data for Beckett to gauge accurate values.
btw I recently bought this 14 Plank as a SGC "authentic" thinking it was trimmed. But PSA re-graded as a 1, I think due to the cut or tear at bottom right.
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