Every profitable bettor, whatever their style, is doing one thing: betting only when the price is wrong. Value betting isn't a system — it's the definition of winning betting itself.
Expected Value in One Formula
EV = (your probability × profit if win) − ((1 − your probability) × stake). A +150 bet you judge 45% to win has EV of (0.45 × 150) − (0.55 × 100) = +12.5 per 100 staked. Positive EV compounds; negative EV — which is every random bet after vig — decays your roll at a predictable rate.
Estimating True Probability
Your edge must come from somewhere: statistical models, market timing (beating moves), specialization in niche leagues the books staff thinly, or promo exploitation. 'I watch a lot of games' is not an edge — the line already contains everyone who watches a lot of games.
Closing Line Value: Your Report Card
The closing line is the sharpest estimate of true probability available. If you consistently beat the close — betting +150 on lines that close +120 — you almost certainly hold a real edge, and results will follow the math. Track CLV on every bet; it converges to truth hundreds of bets before your win-loss record does.
Frequently Asked Questions
What win rate do I need to profit?
At standard -110 pricing, 52.4% breaks even. Sustained 54-55% against closing lines is professional-grade.
How many bets before I know I have an edge?
Win-rate significance takes 1,000+ bets. CLV gives a statistically meaningful signal within a few hundred.