Back when I was an annual member of PSA, I used my 15 included grades one time to do a Graded Card Review submission. I think 6 of my 15 were upgraded, the others stayed at the same grade.
That was probably above average at the time. If you crack and resubmit, they have to give it a new cert number. If you send back the original flip, they'll remove the original card out of the Pop Report so that it stays more accurate.
New grading company TAG, which does assessments using Machine Learning, can spot cards getting resubmitted and promises never to give the same card a higher grade, or you get some cash bonus for fooling the algorithm.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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