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davidcyclebackKen, I meant if PSA could know exactly where .5 was (no margin of error), rather than rounding to nearest available number.
As we agree, PSA's .5 is really just a notation, and it can be left at that. Discussion of .4s and .6s is academic, as PSA can't measure that precisely.
Though another academic question for thought is, is it legitimate for a PSA set registry set to have a average numeric grade of 5.55 or 7.23? What does such a number really represent? As one example, can an average grade be more precise than a single grade? Or, considering PSA's grading 'rounds' to the nearest number (6.0 to 6.5, 9.0 to 10-- there is no PSA grade of 6.2 or 8.7), is it legitimate to have a set graded at a grade number that doesn't exist and has not been similarly 'rounded'?