I'm going with the nobody risks a 9 to try and get a 10. I don't think there is a single collector/submitter who can even tell you what the difference is. To me the only way you get a 10 is if the grader feels like giving it a 10. I smell something fishy too.
You might risk a 5 to get a 6, or a 6 to get an 8, because each of those cards has a flaw that can be improved. But a 9 is flawless. If you had a 9 and a magic wand to change it, what would you even attempt to do to make it better?
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