Value betting is the practice of finding bets where your model's probability exceeds the sportsbook's implied probability. You're not betting on who you think will win—you're betting on where you believe the market has mispriced the odds.

Emotional bias drives most betting behavior. People back teams they love, players they admire, or outcomes that feel "right." This creates market inefficiencies on underdogs and unpopular picks—exactly where value lives.

If you place 1,000 bets with +5% average edge: - Expected profit: 1,000 × 0.05 = 50 units - But variance means you might see 400-600 outcomes Short-term variance is unavoidable. Only by betting enough instances does your actual ROI converge to your edge.

Parlays combine multiple bets into one ticket with boosted odds. While the potential payout is higher, you're actually worsening your expected value: - Single +5% edge bet: +5% expected ROI - 2-leg parlay: +5% + 5% = higher variance, not higher edge Parlays multiply volatility while typically reducing overall expected value due to the sportsbook's increased margin.

The Law of Large Numbers states that as sample size increases, actual results approach expected results. With 50 bets at +5% edge, you might see -10% to +20% ROI. With 5,000 bets, you'll see +4.5% to +5.5% ROI. Patience is essential.

1. Always bet with a defined edge threshold 2. Never increase stake after losses ("chasing") 3. Track every bet in a database 4. Review performance monthly, not daily 5. Accept that losing streaks are normal 6. Trust the process, not the outcomes