In a year or two, I may try to start some vending machines. I have been researching them lately, and it really seems that if you can get a good location then you should be making a nice risidual income each month.
I love how people think that there is no money in sports betting. I hear all of these people saying they should just hold their bets, etc. Well, I go down to Vegas for a few days, walk into the nearest sportsbook and there are people there that are making $80,000 off of an initial bankroll of $100,000, and all of that is in the last week. If you get only a fourth of that return you would still be living the good life. It is all about how big your bankroll is. You can hit 51% of the time and still make GREAT money each and every year.
I would say, take whatever amount of money that you can afford, and go to Vegas for a week or two per year. Don't let yourself get distracted by anything else there, just go to the sports books every day for that one or two weeks. Study how the lines are moving, etc. and possibly get some picks from someone that hits at a good rate. I know of several that average AT LEAST 10-20+ units per week, and that adds up if you have, for example, $400 units. You play 4-5 units on each game and at the end of the week you should be up big. If you only got that minimum of 10 units that week, then you would still leave with about $4,000.
Basically, if you just play smart and have a large bankroll, along with some GOOD picks, then I believe that you have a VERY good chance of making at least a decent living by just betting sports for a few weeks/months out of the year. Sports betting is like any other investment, you must have a lot of capital to get a reasonable return.