Not getting involved in the debate but just thought I'd add that there are only 3 red back PSA 8's in existence, none higher.
Black backs, which is surprising to me, have 1-10 and 6-8's.
3's, 4's, and 5's have certainly seen a rollercoaster ride over the years but it looks like 6's, and especially 7's and up have been climbing pretty steadily as of late.
Not sure how much, if any, these higher end copies drag up the lower ones, but all I'll say is I'm glad I finally got one this year.
https://www.psacard.com/auctionprice...ues/178493#g=7
https://www.psacard.com/cardfacts/ba...-back-1/739284