It's All Relative
Casinos and gambling are what they are. Nobody's ever claimed it was one of the more noble or selfless industries out there. It's never been a secret that they're there to make money. I think just about everyone who plays slot machines knows they are going to lose money, but they take their chances and most have fun -- I don't see anything sleazy about it, per se.
Certainly the casino industry isn't nearly as sleazy as countless examples from dozens of other industries, such as the pharmaceutical, health, oil, insurance, legal, credit card, & tobacco industries, to name a few.