How come 1975 OPC psa 8's sell for more than..

topps 8's but, apparently opc 9's and 10's do not? Even raw a nice opc will usually sell for more than a topps. ANyone got the answer.
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WTB: PSA 1 - PSA 3 Centered, High Eye Appeal 1950's Mantle
9's/10's are a BIG bargain in OPC!