Another way you can think about it is the amount of poses out there. There are around 2460 poses. Jay knows the exact number. If the average pose had 12 examples, that would give you the 30,000. There are plenty where 1-2 are known for a pose and even more that are well over 12 known examples and I assume just as many where 12 is a good guess as to what is left.
I'm not sure if 12 is a safe middle ground. If you ask some pose collectors, even easy to find players have poses that are nearly impossible to find.
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