Base Set 2 Kakuna #47: PSA 9 vs PSA 10

On Base Set 2 Kakuna #47, the PSA 10 premium is one of the widest gaps in vintage WOTC: PSA 10 sells for 11.1x a PSA 9, a $101 delta. Based on the most recent PSA 10 sale of $110.50 on Apr 6, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.

PSA 10

$110.50

Last sale $110.50 on Apr 6, 2026 UTC

PSA 9

$10.00

Last sale $10.00 on Nov 8, 2025 UTC

PSA 8

$12.37

Last sale $12.37 on May 30, 2022 UTC

The Spread

The PSA 9 to PSA 10 spread on Kakuna #47 Base Set 2.

$101

Dollar gap, PSA 9 to PSA 10

11.1x

PSA 10 sells for 11.1x a PSA 9

Three-Outcome EV Calculator

PSA 9 acquisition cost ($)

PSA resub cost ($)

Probability of each outcome (must total 100%)

PSA 10 (upgrade) 15%

PSA 9 (regrade) 70%

PSA 8 (downgrade) 15%

Defaults are conservative starting points. Adjust based on the specific slab. A borderline 9 with strong centering plays differently than a 9 with edge wear.

PSA 10 outcome (sale price minus resub minus acquisition) $0

PSA 9 outcome (regrade, no upgrade) $0

PSA 8 outcome (downgrade, slower sell, tied capital) $0

Expected Value

Math favors holding the 9

Where this card lands in the broader Base Set 2 picture: a non-holo with a $101 gap between PSA 9 and PSA 10. The PSA 9 to PSA 10 jump on WOTC-era cards reflects population scarcity at the top grade, not raw print run.

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