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Scot ReaderI agree with Barry that increased granularity in grading would do more harm than good. Reasonable minds already differ about whether a particular card should have received a 5 when it got a 3, or vice versa. While this is occasionally due to a grading "error", it is often due to the fact that there is a subjetive component to grading, i.e. how important particular kinds of flaws (creases, staining, centering, etc.) are to an individual grader or collector. If we at least sometimes can't differentiate between a 5 and a 3 due to this subjective element, how could we possibly differentiate between a 47 and a 33?
People say "buy the card, not the holder." While I think this is a mild overstatement, there is a kernel of truth in it. One should consider a holder from a major grading company to indicate a ballpark grade, not some absolute, irrefutable, scientifically precise grade.