You lose, you win but you are supposed to lose more times than your winning time and that is how the gambling system was designed. So never think that you can multiply your money using gambling because it is not an investment or any return yield schemes, it can bring profits if you are lucky so don't blame anything even yourself for losing the money because it is not in your hand.
*weak self-control + high greed = always losing...agree with your words that gambling is designed only to make you lose, but do you realize that when we gamble, we already have a winning moment, it's just that our desire is too greedy and makes our logic lose.