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HankronA reasonable and simple way for eBay to handle this would to have an exclusive list of allowable graders for the graded categories ... As folks would inevitably try and sneak their 'Mint9 + PSA' cards into the category, I would happily endorse eBay charging the seller an administrative fee for moving such cards to the non-graded category. This would also cover eBays concerns about time and money.
Naturally, eBay would never do anything like this.