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Professional sports bettors typically aim for a long-term ROI of 5-10%. Anything above 3% over a large sample (5000+ bets) is considered exceptional. Sharps often run thinner (2-3%) on bigger volumes; recreational winning bettors run at 5-15% with smaller volumes but more variance.

Yield is another name for ROI in betting context. Both measure profit as a percentage of total wagered. The terms are interchangeable — yield is more common in horse racing and European betting, ROI more common in US sports betting and matched betting.

Short-term ROI is dominated by variance, not skill. A 20% ROI over 50 bets means almost nothing — random variance can produce that easily. To distinguish skill from luck you generally need 1000+ bets with consistent staking and odds before ROI starts to reflect your true edge.

Yes — track each segment separately. Total ROI may hide that you’re profitable on NHL totals but bleeding money on NBA spreads. Granular tracking is the foundation of any improvement loop in long-term betting.