I would guess the average is right around 15-20, figuring 2460 poses and a somewhere between 30,000 and 50,000 Old Judge cards exist. The average pose would then have about 15-20 examples.
To answer the Myers question, he is a common player to find, but certain poses are tougher to find even among common players, so the only way to really find out how many approximately exist is keeping track over a long time. I would say at least 100 Myers cards exist and his tagging player pose doesn't show up often, so the breakdown of his three cards could be 40-40-20(tagging). Just a rough estimate based on what I've seen.
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