I'm a huge fan of the multi bet.  Especially if you closely follow a sport.  I feel like I can hit a 5 game parlay with much better than the odds presented based on how much information I consume regarding NBA basketball.  I frequently make tiny bets, and while most of them are in fact losers, I win with a much higher % than the odds I am given.  1 large parlay can make up for weeks of losses with a very small bet.  Everything to me is risk reward.  I don't want to take a risk to double my money, I want to take a risk to 50x my money.  If it's an educated risk, all the better.