The other problem from a TPG perspective with downgrading is that I would imagine they would be liable for the difference in value in the card by downgrading since it would have been their mistake. Unless the error is egregious I doubt there would be an inclination to downgrade.
And I agree with Barry that since most people would only be submitting cards they feel are high end for the grade anyway, the likelihood of legitimately necessitating downgrade is slim.
In terms of numbers, lets say they get the grade right 98% of the time. Among the 2%, let's say some deserve upgrades and some deserve downgrades. My guess is that it is highly unlikely that the ones that really ought to be downgraded will get submitted with the hope of an upgrade very often.
JimB
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