Professor's Research [Professor Sada] - 189/198 Rev Holo

Professor Program Promos - #189/198 - Other - Promo

WatchRaw to grade

Max buy: none
Current: $13.40
Expected ROI: +28% (-10% … +73%)
Confidence: Low confidence in this verdict, show why
Low confidence in this verdict
The worst case loses money (-10%)

Rank #175 of today's pool · score 17Top EV

Worth a look: No PSA 8 downside comp.
No price lets the worst case return 20%.
On comps of 76 the worst case is -10% (best case +73%).

No PSA 8 downside comp

Checklist 0 of 1 checked

Search eBay sold for a PSA 8 to size the downside.eBay sold PSA 8

Current

$13.40

PT ok$13.40 0%Scarcity 59Grade EV +28%

All-time high*

$50.49

All-time low*

$12.27

vs high

-73%

On sale - 73% off - Basing View on TCGplayer eBay Buy It Now eBay Auctions

Identity checkMatches

✓CardProfessor Program Promos #189/198 · Rev Holo

✓Tracker matchProfessor's Research [Professor Sada] - 189/198 · Professor Program Promos · #189/198

✓Raw pricePulse $13.40 vs tracker $13.40 (+0%)

✓Gem rate50.0% · GemRate card search enrichment · this printing

✓PSA 10 comp$422.63 · PokemonPriceTracker 90d · matched by product ID

✓PSA 9 comp$70.47 · 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+28%

PSA 10$422.63PokemonPriceTracker 90d

PSA 9$70.47PokemonPriceTracker 90d

PSA 8-PokemonPriceTracker 90d

Net EV$24.78$111.84 net sale vs $87.06 cost

EV rangeEV range: -10% / +28% / +73% (pessimistic / expected / optimistic)Max buy: none (the pessimistic case can't return 20% at any price), with the card's value held at $13.40PSA 10 rate 36.2–63.8% (80% interval on 10 / 20); comps ±12.0% (comp quality 76). 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 $13 value, starting assumption)

Break-evenNeeds ≥ 17.4% adjusted (≈ 34.9% population)

CostsRaw $13.40 + shipping $5.00 + grading $59.99 (expected) + submission shipping $6.00 + time cost $2.67 = $87.06Net sale after fees: PSA 10 $357.31 · PSA 9 $55.08 · PSA 8 $4.95 · ≤7 $4.95PSA 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 premium6.0x

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 6.0xSupply constraint 25/100

Raw validationconfirmed

TCG market$13.40

Pulse price$13.40

Delta0%

CheckedOct 13, 2026

Professor's Research [Professor Sada] - 189/198PSA comps refreshed Oct 13, 2026PSA sales window 90 days

Signal context1

Drawdown73% off peak, Basing

*All-time high/low are within the tracked window (2024-08-08 - 2026-10-14). Raw, ungraded TCGplayer market price (blue) and cheapest listing (grey) via the free TCGCSV mirror. Personal, non-commercial prototype - not investment advice.