The evil tempts humankind since the early times, as we can see on the stories and teachings which have been told to us by our ancestors and which are intrinsic to our societies and cultures, doesn't matter where you are from, as it's common to all of us.

Naturally, the desire and pursue for money is directly related to that temptation, which turns mankind into greedy individuals who lose control over their principles and values, so they can achieve material wealth and become more important and influent among their pairs. We don't know exactly from where such temptations come from, how they take control of us, and why some individuals are stronger than others when resisting to them.

But we can't deny it doesn't happen or doesn't exist. However, it's not possible to say demons manipulate the bets' results on the favour of the casino, because we know there is factor called house edge, which gives a mathematical advantage to the casinos on long run. That is why they profit and gamblers lose.