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JimBAnother possible reason for PSA having graded more high-end cards is that when they started they were more or less the only game in town. And at that time people were not sending mid and low grade cards in for grading. It was almost exclusively the higher grade stuff that was getting submitted. In the past five years or so there has developed a marked for mid-grade and low-grade slabbed cards and that happens to coincide with the flourishing of SGC. Just another issue to consider.
JimB