For each grader (PSA, CGC, BGS, SGC, TAG) we look at the public population report and
compute the probability your raw card lands at each grade bucket: 10 /
9 / <9. Multiply each probability by the 90-day
median sold-comp price for that grade, and sum to get expected value (EV).
Net profit = EV − raw price − grader fee − return shipping − eBay sales fee.
The eBay fee is 13.25% of expected sale price plus $0.30 per transaction, toggleable in
the header. The verdict is GRADE if net profit exceeds $20 — that's the
threshold below which the round-trip risk and time isn't worth the upside.
A grader is flagged insufficient sample if total_graded is below 50 —
probability estimates need a baseline of submissions to be meaningful, and on tiny
samples a single oddly-graded card distorts the rate.
Raw prices come from PriceCharting loose comps as of 2026-05-04, manually transcribed in
raw_prices_seed.json. Pop counts and per-grade sale comps come from public
PSA POP Report and recent eBay sold listings.