I'll take that bet any day of the week.
I've just searched through 200 Fantastic Four books on eBay...not one of them had solely a numeric grade.
A percentage (around 25%) had a numeric grade in parenthesis, with the alpha grade leading.
CGC have been using a numeric grade since inception, and solely a numeric grade since what, 2005?
Not exactly catching on in the overall market, is it?
I stand corrected, the books I mentioned were alpha/numerical not just numerical.
Non the less, OSPG sometime in the last 15 years has changed their standards to include a numerical scale.
That being said, don't most raw collectors base the value of their books according to OSPG?
And if so, then they all should be familiar by now with the numerical grading system.