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PCI do not think that the 100 point system, with 20 point subgrades/ranges, would clear up the confusion. As an example, if an otherwise perfect card has a hole in it, and received a zero for the 20 points assigned to "surface" (or whatever), it would grade out as an 80. Would that card be as nice as other 80s? Probably not as nice as a card that got 16 out of 20 in all five categories.
Becketts has, and the old SCD had, subgrades which I think are helpful, but Becketts will not assign an overall grade more than one level (or is that half a level?) higher than the lowest subgrade. That system works well for the "hole in the card" example, but it does not work as well for very minor defects.