u might want to look into sports arbitrage. bet on both sides of a game at different sportsbooks when their odds are off alot. these arb opportunities dont come very often but usually ROI is 2-10% per game. i'm researchin this stuff now and will probly be gettin into it when i have a big enough bankroll, doesnt seem to take alot of specialized knowledge. so, thats probly something interesting to consider.
The sportsbook usually have caps on the maximum amount you can bet, so you can't really make 2%-10% guaranteed on any amount. Not to mention that sporstbooks sometimes keep your money, so it is not risk free. Also, you have to be fast so it is a time consuming endeavour.
Be careful too, most of the alert providers suck. Here is a good review:
sports arb review
If you don't already know here is a review for sports books too:
sports book review
Cool thread by the way.