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warshawlawthat rarity is not the same as condition rarity. High grade cards that are rare are good investments. High grade cards that are condition rarities (i.e., there are lots of lower grade specimens) are much more speculative investments. They depend on the continued competition of a comparatively small segment of high grade set builders. I would much rather have a PSA 3 T206 Plank than a PSA 8 T206 Cobb because I know that the Plank will always be in demand from a wide audience of collectors.