Larry Mak is a former science writer at the California Institute of Technology. Although the casino does provide a variety of opportunities for fun and entertainment, its primary business is not to entertain, but to make money.
Someone has to pay employee salaries, operating expenses, stockholders, etc.
It all depends on your point of view. Every casino is licensed, and its activities are closely monitored by a state gaming board or commission. A casino makes no secret of the fact that it wants your money. But it would not risk losing its license to conduct a multimillion-dollar business just to cheat an unsuspecting player out of a few dollars. There is, therefore, neither a best day of the week nor a best time of the day or night to play.