Quote:
Originally Posted by Peter_Spaeth
As you are a data scientist, I doubt you have enough data to prove that proposition to any degree of statistical signifcance and are just going by necessarily limited personal anecdotal observation. I've seen many examples to the contrary so I can say with equal confidence that I think all things equal PSA outsells SGC. So there.  Not doubting you could find many examples but I bet plenty of counterexamples could be found too. |
Perhaps I should be more specific. With the exception of cards that make the short list as registry chase cards, the data does show that a dead-centered SGC card will outsell an off-centered PSA copy in the same grade nearly every time for HOFers and other cards with strong demand. You can certainly find exceptions to this rule, but in general, it's true. It probably doesn't apply to commons though, or to ultra high grade vintage cards as though are mostly registry bids. But if you take a 52 Topps Willie Mays SGC 5 that is perfectly centered and run it next to a PSA 5 with 80/20 centering in the same auction, not only will it outsell the PSA 5, it will often double it.