Yeah we should, it's not a good way of earning money. If we want to earn money then we should be practical on our actions and make an assurance that you'll grow your money. You can make a business, or invest in something that can help with your growth.
Gambling is a high risk way of making money, this is not for everyone, only few people are successful with investing in gambling, investing in the sense that they are gambling for a living.
Gambling was probably occurred due to the satisfaction of winning and expect to gain more.
It's safe to say it's for entertainment only, winning and gaining more is just like a personal aim, it would vary from person to person.
Some would just want pure entertainment and they are ready to lose their money as they can afford to lose it.