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warshawlawFor much of its earliest incarnation, the SMR had prices for cards that did not exist. I wrote an article on this point in the old VCBC. PSA, it seems, made up prices for cards in the higher grades in many sets and even had the nerve to put + signs on them from month to month as if those non-existent cards had actually transacted and had actually seen increased prices. Shortly before the article came out PSA altered its advertising for the SMR to remove claims that it was based solely on real transactions.
How the SMR rates relative to actual transactions now, I have no idea. I do not subscribe.