What ROI (yield) actually measures
ROI, or yield, is profit divided by total staked — not by the size of your bankroll. It's the standard metric for evaluating whether a betting strategy works over the long run, because it neutralizes the effect of volume: staking more doesn't improve the number, it only reduces the statistical margin of error. A sustained yield of 3% to 5% across hundreds of bets is already considered excellent among professional bettors — most strategies land near zero or negative.
That number only means something if it comes from a complete and honest history: logging every bet, win or loss, is what separates a real assessment from an impression distorted by a few recent wins. See how to keep that record in the learn section.