Base Set PlusPower 84/102: PSA 9 vs PSA 10
The PSA 10 to PSA 9 spread on Base Set PlusPower 84/102 is an unusually wide gem-mint premium: $105, with PSA 10 copies trading at 6.3x a PSA 9. Based on the last tracked PSA 10 sale of $125.00 on May 9, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$125.00
Last sale $125.00 on
PSA 9
$19.75
Last sale $22.79 on
PSA 8
$9.99
Last sale $9.99 on
The Spread
The PSA 9 to PSA 10 spread on PlusPower 84/102 (Base Set).
$105
Dollar gap, PSA 9 to PSA 10
6.3x
PSA 10 sells for 6.3x a PSA 9
Three-Outcome EV Calculator
15%
70%
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
$0
Math favors holding the 9
Base Set 84/102 PlusPower is a WOTC-era release from 1999. The gap between its PSA 9 and PSA 10 prices is $105.
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