Indeed, if you look at the probability and statistics for most games, it really doesn't help for casinos to cheat. Why risk it? Their major investment is the upfront and continuing expense on non-gambling items like good food, shows, anti-cheating systems, compliance costs, and fixed costs. Otherwise they want odds that slightly favor the house, but with enough winning that players are motivated to gamble.
My primary opposition is to state lotteries, which is why I voted against the one in my state. It bothers me that the state is in the business of marketing and promoting a gambling industry. Moreover, it unfairly targets those on lower income. If the state needs more money then have the chutzpah to raise a tax, not create a regressive, indirect one.