![St. Marcus Mars [Alternate Art] OP13-091](https://storage.googleapis.com/images.pricecharting.com/y3ynemo4a6t3gvry/1600.jpg)
St. Marcus Mars [Alternate Art] OP13-091
One Piece Japanese Carrying on His Will · #091 · Aug 2025
Maybe — Proceed with Caution
Should You Grade?
Raw Price
$10.22
Expected Value
$-2.84
Net Profit
$4.78
Gem Rate
61.0%
ROI
+19%
Sales / Yr
92
Negative expected value ($-2.84) — while a PSA 10 would be profitable, the probability-weighted outcome across all grades means you lose money on average at this grading tier. Only 92 sales per year — it may take time to find a buyer at full price. PSA 10 profit of $4.78 is thin — grading fees and selling costs eat most of the margin.
Best Tier for Flipping
Factors in grading cost, turnaround time, and compounding — how fast you can reinvest profits into the next flip.
Profitability by Grading Company
Shows the best-value tier from each grading company based on EV, cost, and turnaround. Pop = total graded population; 10s = grade 10 count.
Price by Grade
Raw
$10.22
BGS 10
$294.97
PSA 10
$50.75
CGC 10
$30.00
SGC 10
$30.00
8
$16.50
61.0%Gem Rate (PSA 10)
+41 graded in 30 days
+88 in 90 days
Grade Distribution (187 total graded)
187Total
PSA 1011461.0%
PSA 96836.4%
PSA 831.6%
Below 721.1%