There are a lot of players around the world. Not every games are favorite in all region. Some likes soccer, some maybe esports or some cricket or others.
Which one are you mostly placing your bets on? Besides, do you think gambler don't care which sport it is. I have seen gambler who don't have any fucking idea about cricket but he used to bet on cricket.
Actually I am focused on tennis for my 90% of bets (the remains are for football or basketball).
Some matches have low odds but outcome are pretty sure for the wise gambler.
If you pay attention to some factors and not play greedy is not hard achieve good returns.
https://bitcointalk.org/index.php?topic=1234109.200 In this topic I post my bets trying to help other gamblers to make a reasonable choice/having some betting suggestion (free nothing required).
As you can see this year I have achieved already 158% of return with a total of 37 bets.
Last year I was lucky enough to reach 887% of return with a total of 13 bets.