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sagardI think you can extrapolate the ratios in another way. Take the cards with a tons of submissions to SGC (HOFs) and measure the ratios of EPDG in those. It won't be perfect but a 200-300 card sample of a single player card may have less bias than a sample of a 400 card T206 collection.
I'd take a look at the data myself, but I won't get to it until the weekend.