You could gamble for a living if you cheat the casino or either play poker since is a game were not only luck but skill ... and yes most of the people is living for the gamble.. that's sick because they do not only ruin they'r life but family and loved ones.
Most of us cannot gamble for a living as we do not know how to cheat and cannot cheat. Most of us also do not have the skills to win in skill games such as poker. Casinos live on gambling as they provide the gambling service. They deserve the profits.
You really don't need to cheat to win with gambling, unless you're trying to game luck-based games. Also skills like playing poker are very learnable, not something you naturally get.