Is it possible to spend daily expenditure by gambling money? I think this is not possible. If you play gambling, the loss is more than profit. But yes, many people can play gambling very well and they can earn a lot of profit. But I would say gambling is never a profession. So it is better not to earn money by playing gambling. Gambling should play just for fun. You should not spend your pocket money with gambling money.
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Very bad idea. You may be able to profit out of gambling, if you are very lucky. But you can't set a goal of any kind. If you are risking your money meant for some other expenses and in the end you incur losses during gambling, then you may find yourself in a very tough situation. Do gambling only if you have surplus money with you.