Let me phrase it another way. A collector pays a huge premium for a PSA 8 because it is a 1 in 1 and he wants to own the best example. He is not aware that there is another example graded 9 by SGC, as well as one graded 9 by Beckett.
Shortly after he buys the card either the Beckett or SGC example is crossed over to PSA, who assigns it a 9 grade. The buyer no longer has the best example, but now the second best. And had he known of these other two, he never would have paid the huge premium (I know all this information is available on the web, but we're talking theoretical here).
Again, just put the information out there and let prospective bidders assess it however they choose. It's about providing more information, not less. If I'm going to lay out big bucks I want to know as much as possible. You can limit your information to the big three grading companies.
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