A lot of high grade collectors depend heavily on low pop reports to determine the value of their cards. So a PSA Pop 1 of 1 is worth a lot to them. But Pop reports are not an exact science and the numbers are often very misleading as a result of things like crossovers, resubmits and raw collections. As was previously said, Pop reports help with things like relative scarcity -- but even there you have to be aware that rare cards get graded more frequently than common cards and the pop reports will reflect that, too, suggesting that certain common cards are equally scarce as rare cards when in fact they aren't.
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