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Scot ReaderPSA is only bumping about 3-5% of cards submitted under the half-grade service. Moreover, most collectors are only re-submitting cards they think are particularly strong for the grade. Given the rigor of the half-grade standard, cards receiving a "point-five" grade cannot be thought of as simply at the midpoint between two integral grades. The PSA half-grade is better thought of as a qualitative, aesthetic metric without an exacting quantitative basis.