I wonder if they have a system setup that takes a random sampling of cards each day and have them reviewed for validation by a second or even third "expert" at the TPG? This way they could have metrics for the folks who do the grading and hold them to a certain standard. The second or third person would then validate the grade of the first grader (yes I know sometimes it seems like a first grader actually did the inspection) and they could keep statistics on each grader this way to help improve their skills.
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