Matt- you are absolutely correct that there would be subjectivity, particularly for a photo that straddles two grades. But actual grading is likewise very subjective and very inconsistent. I don't believe this system would be any worse. When you have one where you can submit the same card to a grading company three times and receive three different grades, you have very few objective standards at all. Adding this photo quality assessment shouldn't make it any worse. But of course there will be some kinks to work out.
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