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T206Collector...is only half of the curve. Demand is equally important. Price is determined where supply intersects demand.
For example, if I cut my finger nail into a bowl and let it sit there for over 100 years, it will be an antique finger nail. It will also be unique. There will be only one in existence. But it's value will be zero because there is no demand for it.
Now take 50 Honus Wagner cards, and a zillion people that want them. That is why they are more valuable than some other vintage cards that are technically more rare than the Wagner card.