Yes, once you gamble and you lost and you lose all your money, you will feel regret, you will think that you could have spent your money on different ways that could benefit you more
The problem is they will not regret it at all. At first they will regret but once they got some money again, they will back to gambling again for sure. Gambling give you a lessons in life yes but in the end most of gambler will repeat it again because of greedy.