Scott
Not sure why this happens. If their call is usually right, mistakes expected, though not way off.
It would appear to be a hazard of use of grading companies. But of course a hazard/risk of anything we deal with. Most of my grades from SGC or PSA have seemed right on the mark.
In my field, it would be a person's risk/hazard of dealing with the medical industry. In the grading card case, you can try and get it corrected(asking for review/regrade), in medicine, sometimes cant fix it.
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