The size of slabs is a huge reason to not grade complete sets anymore. I fit about 170 comfortably in a USPS Priority Board Game box when I started selling them through COMC. Plus, for the vast majority of early 1970s commons, PSA 8-9s are no longer the $50-100 they used to be, they're $15-30. So they're no longer profitable to grade.
1975 Mini is an interesting set; I found a group of them a few years ago that I thought were worth consideration for grading. However, I decided to sell them on eBay and lost money on them. Most of the crazies who collect that set in PSA form have already upgraded everything they can and are no longer really buyers. It's one poised for a crash, IMO.
Selected five at random from the PSA Auction Prices tool and found:
#6 Mike Marshall: PSA 8s under $10, 9s around $90
#19 Koosman: PSA 8.5s for $10, 9s around $45
#33 Baker: PSA 8s and 9s for under $20
#51 Forsch: PSA 8s and 8.5s for $10
#74 Belanger: PSA 9s under $20
So if you really want to upgrade your raw set, buying graded and cracking out may be worthwhile to you.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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