They also play favorites with their big customers as VCC has illustrated, in noting that high grades get disproportionately handed out to the largest submissions. You can see this in the serial number sequencing. Also, as others have noted, by restricting 10s on high profile cards it increases the “value” of the card and helps PSA keep its somewhat muddled reputation as the slab that is easiest to sell and generates the highest returns.
I should add that I collect PSA and SGC and raw and I do find it interesting how collectors like myself who basically know PSA has a lot of shady underhanded business practices still remain customers. It’s sort of unusual when you think about it at least when it comes to businesses that don’t have a monopoly. Although on second thought maybe it isn’t as unusual as I think.
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