![Professor's Research [Professor Sada] - 189/198](https://tcgplayer-cdn.tcgplayer.com/product/556953_200w.jpg)
Identity checkMatches
✓CardProfessor Program Promos #189/198 · Rev Holo
✓Tracker matchProfessor's Research [Professor Sada] - 189/198 · Professor Program Promos · #189/198
✓Raw pricePulse $13.52 vs tracker $13.52 (+0%)
✓Gem rate50.0% · GemRate card search enrichment · this printing
✓PSA 10 comp$422.63 · PokemonPriceTracker 90d · matched by product ID
✓PSA 9 comp$11.72 · PokemonPriceTracker 90d · matched by product ID
!PSA 8 compNone (optional downside)
Your grading resultsNone logged
Your results on this set: none graded yet
Your results on Other: none graded yet
Other grade odds use the starting assumptions until 5 Other grades are back.
Graded economics+6%
PSA 10$422.63PokemonPriceTracker 90d
PSA 9$11.72PokemonPriceTracker 90d
PSA 8-PokemonPriceTracker 90d
Net EV$5.63$92.82 net sale vs $87.19 cost
EV rangeEV range: -35% / +6% / +57% (pessimistic / expected / optimistic)Max buy: none (the pessimistic case can't return 20% at any price), with the card's value held at $13.52PSA 10 rate 36.2–63.8% (80% interval on 10 / 20); comps ±16.5% (comp quality 67). The 80% interval, the comp band and the ×0.5 / ×1.5 fallback without population counts are starting assumptions.
Outcome mix10 25% / 9 38% / 8 22% / ≤7 15%
PSA 10 ratePopulation 50.0% → adjusted 25.0% (Other, ×0.50 at $14 value, starting assumption)
Break-evenNeeds ≥ 23.4% adjusted (≈ 46.8% population)
CostsRaw $13.52 + shipping $5.00 + grading $59.99 (expected) + submission shipping $6.00 + time cost $2.68 = $87.19Net sale after fees: PSA 10 $357.31 · PSA 9 $4.66 · PSA 8 $4.66 · ≤7 $4.66PSA tier: Standard $59.99; about 133 days at PSA. PSA and eBay fees from their official pages; eBay fees include 7% sales tax in their base; that, the shipping and the 10%/yr time cost are your assumptions (Settings).
Grade splitOther grade split (starting assumption); ≤7 valued at 90% of raw; no PSA 8 comp, so 8s valued like ≤7
PSA 10/9 premium36.1x
PopulationPSA 10
Gem rate50.0%
PSA 10 pop10
Total pop20
SourceGemRate card search enrichment
PSA 10 velocity-
Total velocity-
SnapshotJun 22, 2026
Scarcity59/100
LabelWatch
Confidence92/100
Supply25/100
Demand71/100
Gem rate 50.0%PSA 10 pop 10/20PSA 10/9 premium 36.1xSupply constraint 25/100
Raw validationconfirmed
TCG market$13.52
Pulse price$13.52
Delta0%
CheckedNov 1, 2026
Professor's Research [Professor Sada] - 189/198PSA comps refreshed Nov 1, 2026PSA sales window 90 days
Signal context1
Drawdown73% off peak, Basing
*All-time high/low are within the tracked window (2024-08-08 - 2026-11-02). Raw, ungraded TCGplayer market price (blue) and cheapest listing (grey) via the free TCGCSV mirror. Personal, non-commercial prototype - not investment advice.