It's really just a pattern for those poses. The scarcity of say Tom Jones with a p350 back would be hard to compare to any other back in a general sense. You could look up all the pop numbers for these poses with p350 and then compare them to say, the average pop numbers for AB350 no frame if you wanted. I would guess those numbers would be pretty similar.
Also, for the most part, these poses are not any tougher with EPDG back than other 150-350 series poses (for instance Ganley EPDG is not any harder to find than say O'Leary portrait with an EPDG back. They just get a bump in demand because these 11 poses don't have as many mid-tier backs to pick from.
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