What VCP does...
VCP attempts to collect as many actual sale prices of cards from various sites (ebay and auction houses) as possible. So these are "real" sales, not just someones opinion of value. Take that all with a grain of salt, however, because there are always outside forces that have influences on card prices: shill bidding, poor advertising or listing info, etc.
I only collect T206 (and specifically only common backs), so my approach is to get a one day membership every two months and record the values of the various grades (20-60) of each card in the set. This costs me $24/year.
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