I know some friends who started becoming addicted to football gambling.
Losing tons and still winning out some in the long run.
Eventually they learned they lesson and are still winning big time by betting at only matches they know more about.
That is really sad to hear because people are losing so much money and that too it is not that they are super rich and it wont effect them. People try to make money from gambling and forgetting that hardly few only win and rest of them will lose their money.