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

Australia A-League
2013-12-08 06:00:00	Over	Under	Prof. %
Melbourne Victory - Newcastle Jets	2.53	2.10	14.75

Soccer | World | World Cup 2014 - Group C
2014-06-14 16:00:00	1	X	2	Pr %
Colombia - Greece	1.91	4	8.33	11.9059

Soccer | England | Championship
2013-12-14 15:00:00	> 2,5	< 2,5	Prof. %
Doncaster Rovers - Leeds United	2.3	2.02	7.54629

Soccer | Bolivia | Torneo Apertura
2013-12-08 19:30:00	1	X	2	Pr %
Nacional Potosi - Real Potosi	2.2	3.8	4.65	7.20905

Bolivia Torneo Apertura
2013-12-08 20:00:00	DNB1	X2	2	Pr %
Sport Boys - Oriente Petrolero	1.90	1.50	5.75	7.11

Greece Super League
2013-12-08 15:15:00	DNB1	DNB2	Prof. %
Panthrakikos - PAS Giannena	2.04	2.25	6.99

Soccer | World | World Cup 2014 - Group D
2014-06-20 16:00:00	1	X	2	Pr %
Italy - Costa Rica	1.38	6.5	17	6.68859

Soccer | Germany | Oberliga Nordost-Süd
2013-12-08 12:00:00	1	X	2	Pr %
Hallescher FC II - FC Erzgebirge Aue II	2.62	4	3.2	5.91208

Soccer | World | World Cup 2014 - Group A
2014-06-12 20:00:00	1	X	2	Pr %
Brazil - Croatia	1.4	6.4	12.95	5.51241

Soccer | World | World Cup 2014 - Group F
2014-06-25 16:00:00	1	X	2	Pr %
Nigeria - Argentina	11	5.5	1.48	5.44042

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.