If people could earn by gambling at casinos then nobody would study, work hard to earn money and everyone would flock at casinos and get their daily bread. Whoever thinks that gambling is profitable in the long run or short run is living in a fool's paradise.
Gambling is not a job. Its not a job that can give decent profit. Sometimes you will win and sometimes you will lose. Thats how unstable it is. Most of gamblers did not make earnings and few are lucky to have earnings. You cant assure every bet you take will always in a winning situation. So gambling not really a job for a living. Find a decent job instead