Hi Russell - I think CGC puts the Nic Cage/Dallas Stephens notation on the label, but they are certainly NOT pedigrees, or recognized as such (not in the classic definition of pedigree anyway).
Initially we did note MH2 sales, even though this was not originally noted on the CGC label. And more recently the MH2 has appeared on the labels. They usually bring in a higher result and hence why we originally noted the MH2s.
I don't think the NC/DS books have generally brought in a higher sale price, but I'm in categorization so I can't say for sure. It's something for George or Simon to report on as they are closer to the market reports.
Cheers
Rich