Rookie question: PSA value calculation

Hey guys, I have a quick question regarding a recent submission of mine. I was told that in shipping PSA assessed a "value" of around 10K for my submission. Anyone know how they calculate this and whether their "value" calculation is a reflection of other assessments of value such as VCP (vintage card prices)?
75 Minis - GET IN MY BELLY!
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Comments
It would be a reflection of thier value based on grades
1948-76 Topps FB Sets
FB & BB HOF Player sets
1948-1993 NY Yankee Team Sets