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Judge Dred (Fred)Trying to track all sales of SGC, PSA and GAI graded vintage cards could be a full time job for someone. I couldn't imagine that anyone would do this voluntarily and I couldn't imagine the big 3 tracking this because there would be NO INCOME generated by tracking this data.
People might say that a more accurate portrayal of the hobby spending habits could increase the grading services revenue by having more people have their cards encapsulated. Unless there's an immediate ROI I would venture to guess that the big 3 would have no interest in collecting this data.