Net profit divided by total amount staked — the truest measure of betting performance.
ROI is your net profit divided by the total amount you have wagered, expressed as a percentage. In betting it's often called yield. Unlike win rate, ROI accounts for the odds and stake of every bet, so it reflects money made rather than bets won.
A positive ROI over a large sample is the clearest sign of a real edge. Even elite bettors typically operate on low single-digit ROI, because markets are efficient and edges are thin.
