How about this..

Backing football correct scores which are 1.4 times higher than the high street..There's at least a couple of em in every match, mostly the 2-3, 3-2, 1-3, 3-1, 0-3, 3-0 and 3-3..should return a profit long term if you assume that a 10.0 on the high street should be more like 12.0, then add 20% on for a good measure of profit margin and to cover commission, so a 10.0 on the street becomes 14.0 and a 30.0 on the street becomes a 42.0..if you can get these inflated prices then mucho paydirt..as long as patience and discipline is applied..