Gambling can be great if you know anything about sports.
I knew enough about the sport, but it does not guarantee you to win big on gambling. even if you choose a big team you can lose, all about luck. I like soccer and soccer gambling does have a very high risk
Gambling in every shape have big risk not only in Soccer as few minutes ago few pundits give picks of heavily favorites in Tennis but they lost badly matches against underdogs
Gambling can sometimes be very solid. For example when you have an exceptional champion Mayweather, it's pretty much money in the bank every time. I always told my friends to bet on Mayweather for some easy money, they said i was crazy to do betting, but I won like 20 times (I started betting on his 29th fight until his last 49 one.)