For me, it always comes down to a simple reason.
Since the most often used/discussed
(I assume) qualifier is the
OC, let me present this.
Here are a pair of nearly identical cards, one being a
PSA 8 OC and the other being a straight
PSA 6.
• The one with the
OC is entirely more 'accurate' to me, because the label intimates,
"This card has all of the attributes of a PSA 8 card, BUT it is off-centered.
• However, since the
PSA 6 has the same type of bad centering, it's nearly impossible to see it and know that it was 'lowered' to a
PSA 6,
BECAUSE it's off-centered.
It is much more likely that a person looking at it will think it is a
PSA 6 THAT IS ALSO badly off-centered...and in essence nothing but a
PSA 4 (value-wise).
QualifierOCexamplecomparison.jpg