In economics the reward for entrepreneurs is profit or lose and I doubt that any of them will take the lose option, so casinos and bet owners obviously wants to make profit from their businesses. I do believe that standard businesses wants to give their customers value for their money so they won't mind some gamblers winning, so far the aggregate of losers is far greater than the winners, the casino owners will be happier. Some casino owners will see their establishments as recreational facilities where people come to spend their money to have fun, so it doesn't matter if they're loosing their money, so far they're enjoying themselves. Although the reality about gambling is that generally gamblers lose more than they win, meaning that the gambling companies profits more than they lose.