Just now reading the opening post, in my opinion based on the scan, the Art Shell PSA 10 was clearly overgraded based on the bottom left corner.
What's bothersome is that a person who claims to have been a professional grader should have clearly seen upon inspection with the training of a professional grader that this card was overgraded. Rather than correct the oversight with PSA, he chose to make a huge profit on the card.
As stated by many others, there were other salient issues, arguably more serious than bumps on crackouts that were never addressed, which I find rather disturbing.