I'm not buying a 25% difference between the 5th and 6th series either. The 5th series cards are graded when they are in great condition. The 6th series cards are graded in any condition. You want a better reflection of the differences - try looking at PSA 7 5th series versus PSA 6th series cards. I still think that would be a bit inflated (as the last cards issued in each year were less novel and I bet they got destroyed less), but it would be a better proxy.
Cheers,
Patrick
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