I don't know if it's that simple. Looking at big name HOF rookie cards, it seems that 9s and 10s (when there is a decent sample size) have consistently outperformed 8s and 7s over the last five years. Arguably, the "smart money" is on the investment value that comes at least in part with the grade. It's also typically much easier to move one example of a card versus six or seven or more.
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