Question regarding resubmitting your graded cards to PSA.
My best friend recently had 15 vintage cards (pre 1981) graded by PSA. He received ample PSA 7's for cards that he and many others thought had a decent chance of receiving a 9. He recently returned to the hobby like I have after being away for ample years. He submitted hundreds of cards last decade and knows how to grade. He wants to resubmit some of them to PSA immediately. My question is should he wait and if so how long?
PSA claims the graders have no idea who's cards they are grading and if that's the case it won't hurt to resubmit them. My buddy does not care about the grading fees. Still I have recently heard multiple dealers at conventions say that resubmitting the same cards within a short period of time is a waste of money as the chances of any grades changing for the good is minimal at best. .
I would appreciate your opinions