Market share
One of the primary issues that is driving the spread is market share. Collectors Universe is obviously a publicly traded company and has to report various metrics and one of those is market share.
Last year in one of their quarterly reports they indicated that they have 90% of the new card submission market. SGC has 1 or 2 points of market share for all cards being graded currently.
Take position bias out of the discussion and if you are in an industry where another competitor is this much larger you aren't even considered relevant.
I have used SGC once and their customer service was great and I was pleased with the grading accuracy and presentation in the holder. That said I have no illusions that those cards will ever sell for what they would in comparable grades in a PSA holder.
PSA is the 800 pound gorilla at this point and the values have followed.
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