Advantage of a job or business over gambling is that while you are working you are assured of a fixed income and while you are running your business you are also guaranteed of monthly turnovers which you can plan your budget
Ok, so two things
- owning a business or being employed doesn't mean complete assurance, you can get fired tomorrow or your business might get down, personal experience after the 2008 crisis we had to fiance our family business with our own money
I know, I have also undergone this experience, losing job and the business at the same time, not very good but it will make you really tap inside of you just to make ends meet and then comeback. And this is going to be a life long lesson for everyone to really save money because we really don't know what the future brings.
Same with gambling, there is no assurance that you are going to be very lucky everyday or at least once or twice a month to win that kind of money. And if someone says that they can make that kind of money, it's either they are not telling the truth, or they are significant skills, like in poker or professional sports bettors, and they have the discipline and stick to it, together with a good bankroll management.