Third-party graders are literally and allegorically the "men behind the curtain." There is intent in the process being shielded from the customer -- the mystery of the grade is part of the value; and a hidden process is not as susceptible to genuine scrutiny.
If you could watch your card being "graded" you might find yourself arguing with the grader, and trying to influence the outcome. But, that you cannot engage in such a conversation with the grader doesn't mean nobody can.
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