Comparing the odds gives you another interesting option - a sure bet called also an arbitrage bet. If you know exactly what this definition means and you need no additional information about sure bets you will probably would like to look at free sure bets list.
And briefly: playing sure bets is probably the only way to get a real chance to win against bookmakers.

View an example of Sure Bets!

Sure Bets Finder:   All - Today - Tomorrow - Next 3 Hours - Next 12 Hours - Top

Basketball | Europe | EuroBasket Women
2013-06-19 15:30:00	> 122,5	< 122,5	Prof. %
Serbia - Belarus	2.4	1.9	6.04651

Argentina Copa Argentina
2013-06-19 21:30:00	1	X	2	Pr %
San Lorenzo - Atletico Rafaela	1.90	3.80	6.50	6.01

World Confederation Cup
2013-06-19 22:00:00	1	X	2	Pr %
Italy - Japan	1.98	3.90	5.50	6.01

Soccer | Argentina | Copa Argentina
2013-06-19 22:30:00	1	X	2	Pr %
Atletico Rafaela - San Lorenzo	6.5	3.8	1.9	6.00858

Lithuania Lithuanian A lyga
2013-06-19 17:00:00	1	X	DNB2	Pr %
KFK Siauliai - Kruoja Pakruojis	3.05	3.75	2.10	5.96

World Friendly Internationals Women
2013-06-19 08:00:00	DNB1	DNB2	Prof. %
Serbia - Romania (W)	2.25	2.00	5.88

Soccer | Norway | NM Cup
2013-06-19 17:00:00	> 2,5	< 2,5	Prof. %
Start - Stabæk IF	1.78	2.58	5.33027

World Friendly Internationals Women
2013-06-19 14:00:00	Over	Under	Prof. %
Slovakia (W) - Wales (W)	3.90	1.44	5.17

Soccer | Norway | NM Cup
2013-06-19 17:00:00	> 2,5	< 2,5	Prof. %
Rosenborg - Tromsø IL	1.92	2.32	5.0566

World ATP Wimbledon
2013-06-19 13:00:00	1	2	Prof. %
Soeda Go - Pashanski Boris	1.45	3.80	4.95

The technique also known as sports arbitrage or Sure Bets is a great way to earn without losing sports betting, it all depends on your budget.

Logically, on a limited budget of 100 euros and a SureBets with 3% profit, the gain is relatively low, so you should be able to invest a greater sum of money to see increased investment faster.

We also have a list of the best bookmakers, that having more shares than others, where there are often Sure Bets.

So, having said that, needless to say good luck, since it is no longer to win a bet, but you will start to talk about a real job.