Positive EV, and why it feels like losing
Betting where the price beats the market's own fair value — the slowest-looking strategy and the one that scales furthest.
Updated September 27, 2026 · TrueEdge Academy
Expected value is what a bet returns on average if you could place it a thousand times. Positive EV betting means only placing bets where that average is above zero, and accepting that any individual one is mostly a coin flip.
- Fair probability (devigged)
- 50.0%
- Your book's price
- +110 — implies 47.6%
- Stake
- $100
- Win 50% of the time
- +$110
- Lose 50% of the time
- −$100
- Expected value
- 0.50 × 110 − 0.50 × 100 = +$5.00
A 5% edge on $100. Do it four hundred times and the variance stops mattering; do it four times and it tells you nothing.
Why it feels wrong
A 55% bet loses 45% of the time. Losing four in a row happens roughly one session in twenty-five, and it feels identical to the strategy not working. This is the reason most people who try +EV stop: not because it failed, but because it took longer to visibly succeed than their conviction lasted.
What actually predicts whether it is working
Not profit — closing line value. If the price you took keeps beating where the market settles at kickoff, you are ahead whatever the scoreboard says. See the CLV guide.