We'd like to have 90% white snowballs (winners) and 10% black ones (losers). But what would happen if the white snowballs were the size of marbles and the black snowballs were the size of six foot boulders? It wouldn't matter if there were 10 times more white snowballs, you'd still be crushed. So perhaps you can now see why the golden rule of trading is to cut your losses short and let your profits run.