Singles are WAY more profitable in the long run. The house edge on a straight bet is only around 4.5%, but a 2-leg parlay jumps to almost 9% and it keeps getting worse the more legs you add. switched to singles last year – my bankroll actually grows now instead of these crazy swings. You need to hit like 52.4% to break even on singles which is way more realistic than hoping all your parlay legs hit