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

Norway Tippeligaen
2014-03-30 13:30:00	1	X	AH2(+0.25)	Pr %
Bodo/Glimt - Aalesunds	3.42	3.42	1.98	14.97

Italy Serie C1-B
2014-03-09 13:30:00	Over	Under	Prof. %
Paganese Calcio 1926 Srl - Aquila	2.20	2.38	14.32

Europe UEFA Euro
2014-09-09 18:45:00	1	X	2	Pr %
Norway - Italy	6.80	5.00	1.80	10.79

North and Central America CONCACAF Champions League
2014-03-11 03:00:00	AH1(+1.25)	AH2(-1)	AH2(-1.5)	Pr %
Arabe Unido - Alajuelense	2.03	2.14	2.86	10.36

Scotland First Division
2014-03-11 19:45:00	1	X	2	Pr %
Forfar Athletic - Stranraer	4.00	4.00	2.38	8.68

Europe UEFA Euro
2014-09-08 18:45:00	1X	2	Prof. %
Luxembourg - Belarus	2.34	2.00	7.83

Turkey TFF 1. League
2014-03-09 17:00:00	Over	Under	Prof. %
Adanaspor - Boluspor	4.00	1.47	7.5

France ITF-W Amiens
2014-03-09 14:00:00	1	2	Prof. %
Alice Matteucci - Manon Arcangioli	2.04	2.25	6.99

USA WTA Indian Wells Doubles
2014-03-09 20:20:00	Over	Under	Prof. %
Su-Wei Hsieh / Shuai Peng - Alisa Kleybanova / Anastasia Pavlyuchenkova	1.89	2.45	6.69

USA ATP Indian Wells Doubles
2014-03-10 01:20:00	Over	Under	Prof. %
John Isner / Sam Querrey - Jeremy Chardy / Gilles Simon	1.80	2.60	6.36

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.