The flaw in the "pop" system is that certain cards are graded much more often than others so it appears that certain commons are very tough when they may not be. An example is in the C46 Imperial Tobacco card set. If you look at the number of Gandils which have been graded you would think that card is 5 or 6 times as frequently encountered as one of the commons. The truth is that not many people are collecting the whole set and/or slabbing the whole set for registry purposes. Also you have to factor in that type collectors and/or sellers are trying to get the highest grades possible so they are being re-submitted, etc.
Pop reports are useful but should be taken with a grain of salt.
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