To play devil's advocate, like Glyn already said earlier, you can't really do that. If you are buying cards based upon ALL of the card gradings companies POP reports, you are assuming that all the cards will cross likewise in another companies holders. Even on high grade cards, one companies '9' might be another companies EOT. And if you do succeed in getting something crossed, then you have a skewed pop report if it is not removed from the competitors report. I know we may be overthinking things here, but I am in the camp of KISS (keep it simple, stupid). If a card is graded by PSA, then you mention the current PSA pop only. Don't compare apples to oranges. I think the buyer should do due dilligence himself, especially if he is attempting a crossover.
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