...Instead of using that time to improve yourself, you get carried away and end up wasting it all on something that doesn’t even give you anything back.
This happens only if you come to the casino with the sole purpose of making money and, accordingly, after losing, you will only have negative emotions. And it's quite another matter if you go to a casino accompanied by friends to have fun, then even if you lose, it can be regarded as payment for a great time.