SV04: Paradox Rift Bombirdier ex #234: PSA 9 vs PSA 10

The PSA 10 to PSA 9 spread on SV04: Paradox Rift Bombirdier ex #234 is a wide gem-mint premium: $23, with PSA 10 copies trading at 3x a PSA 9. Based on the most recent PSA 10 sale of $35.00 on Apr 4, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.

PSA 10

$35.00

Last sale $35.00 on Apr 4, 2026 UTC

PSA 9

$11.54

Last sale $10.50 on Jan 19, 2026 UTC

PSA 8

$8.00

Last sale $8.00 on May 20, 2025 UTC

The Spread

The PSA 9 to PSA 10 spread on Bombirdier ex #234 SV04: Paradox Rift.

$23

Dollar gap, PSA 9 to PSA 10

PSA 10 sells for 3x 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

SV04: Paradox Rift #234 Bombirdier ex released in 2023 sits in the vintage WOTC tier where gem-mint premiums above $23 are common. PSA 10 populations shrink faster than supply on cards of this era, which is why the upgrade arbitrage stays alive.

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