I don't think you can do that regularly on a casino. At least not on dice, slots, roulette etc
You can do it in poker of course, but I guess that's the only casino game that has some strategy in it.
Expecting regular income from gambling is not possible. You can make a profit with using your skill set and experience but making fixed amount is not possible. Today you will make, but tomorrow also it is not possible. We have only one choice to make a profit that is skill games like poker and sports betting. Are you use casino games then your profit completely depends on your luck.
Agreed with you, its not possible to earn regular profit with the gambling. There will be a days when you will never get any profit and might loose the money. You have to be very lucky and experienced to make money on a regular basis in the gambling; chances of that are very rare.