ROI is the tournament win rate
Cash games measure edge in bb/100; tournaments measure it in ROI — return on investment. It answers the only question that matters over a career: for every dollar of buy-ins, how much comes back? A 20% ROI means $100 in becomes $120 out on average. Because it folds together how often you cash and how deep you run, ROI is the single honest scoreboard for a tournament player.