Valuing Authentic Cards vs. PSA/SGC Poor 10/1

[SetBuilder]

Why do some collectors consider cards graded authentic to be below a "1" or "Poor" grade? I've heard the term "PSA 0/SGC 0" used by some sellers on eBay and on the forum before. I find this odd, because an authentic label does not convey any grading at all.

The authentic label is meant to infer the absense of a numerical grade. It is the TPG's way of saying "we deem this card to have a defect, but we will not issue an opinion on the grade." In this way, the TPG's defer opinion on a 1-10 scale and instead evaulate the authenticity only with no numerical grade implied.

I've noticed that some authentic cards can sell at or below the price of a poor condition card. In some cases, collectors would rather avoid a trimmed authentic with no creases or rounded corners, and choose a Poor/Good card instead with noticable defects to avoid the stigma of the authentic.

Is this an example of collectors being irrational?