After a carefully thinking about the topic and the reality of gambling, I want to agree with you partly because that statement is true but with some exception. A lot of people do lose in gambling but not everyone is losing so we can say that gambling is designed to give the house edge so they remain in profits. Part of the money lost by majority of the people will be used to pay those that would win and the difference being the profit the casinos will make. This is how I think gambling is designed.
Well, casinos do give you the chance to win sometimes. Yes, it doesn't happen that often, but the fact remains. I have not only seen it myself, but I can also confirm this from personal experience. There were several cases when I was incredibly lucky. There were such wins that my hair stood on end.
Ultimately, the casino has a much better chance of making a profit than the players.