Of course not everyone does the same thing even though they work at a casino, because I think maybe some of them who work there already know the rules that they are only unlikely to win so they don't need to think twice about this they choose not to gamble, besides I think everyone is not happy with gambling maybe some of them work at a casino just to meet their needs so they do nothing more than work.
Although maybe that makes them unable to resist gambling but I'm sure there are people who don't gamble even though they work at a casino, it's just that maybe the number is very small compared to people who gamble. Besides I don't think the casino requires its workers to spend their salaries at the casino where they work, that's ridiculous.

If they know that they can not win from the casino, they will choose not to playing gambling. If they work in a casino because to meet their needs, they should focus with their work and not trying to playing gambling. Even they already see how people lose control in a casino and makes the employee hard to control those who becomes mad and ruins something in that casino. That should makes them not spends their salary just to make more money because that will not easy for them so they better to saves their salary for their needs.
It depends on how those people can hold themselves by not playing gambling in casino and understand the effects that they can get from gambling. So they will not trying to playing gambling when that just give a bad effect to them.
It's like this: we all know the dangers. Casinos are constructed on temptation, so, people find it difficult to resist that kind of influence. Its like a soccer game in which the goal is wide open and the ball is constantly at your feet. You should definitely pass, but occasionally you simply cant help but take that shot.
Those casino workers are right now in the middle of it. Every day they witness the activity, the wins, the defeats, the complete rollercoaster. Its like having a hundred balls flying at once in front of a goalie. You may save 99, but one that passes you by? That is the one you find most vivid in your memory. Yes, conserving your pay is wise as well. These people, though, operate under great strain. A little gamble can occasionally seem like a release, a means of escape from tension. One becomes addicted to the adrenaline.