That's very clever in the casino, that's why once you are in a casino, you are expected to drink while you gamble, and most of us when we get drunk, we are so aggressive and we don't think clearly, so the chance of losing is very high, but then at the end of the day, we still enjoy if we go their to just have some fun.
In short, you don't go to the casino if you don't want to lose your money, it's advisable to be realistic all the time so you'll not end up losing more than you can afford to lose, majority of people go in a casino to enjoy and spend money, though the motive was to make money.