I think for many of us who ask about "pop," it's because we grew up collecting 80s cards where there was huge oversupply. Therefore, we're much more cautious about just how many cards are out there. I think most of us know about the weaknesses of the pop reports as stated above. However, knowing the pop figures can give us a general relative # to compare other cards too. For example, if you collect a higher grade card, which has low pop, that is most likely going to be able to stand up as the pop increases as opposed to lower grade cards. You can also get a general idea of which sets are scarcer than others.
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