Barry,
That is most likely correct but maybe over time if someone were to do this then a separate "preference" if you will would set in for the double-graded cards and then the value differential would reflect that. Sort of like the difference between a PSA6 and a PSA6 OC or MC, but in reverse. In this instance the cards "with" the qualifier (the second grade) would see the growth in value making it harder eventually to move cards without it. Interesting thought you have.
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