This kind of things do happens most in street gambling where gamblers don't mind using cheating system to make sure that they make winnings and sometimes when it is discovered, it do lead to fight that can lead to bloodshed.
Gambling isn't supposed to be honest, it just needs to be fair. But with the way things are going, fairness isn't really upheld and things like these happen because people are not held to a certain standard. Well, what do you expect? So long as an industry rakes in the big bucks, it will slowly lose its morality and sense of fairness. These people know from the get go that if they do certain things, they'll get the huge payout. It's certainly what's happening right now and I doubt it will change any sooner.