No matter how expert one is in gambling, one can never guarantee winning or profit because in gambling it is not possible to win only through experience, luck is required here. So a person can never win from gambling constantly and can never earn a fixed amount of money weekly or monthly from gambling. So gambling should never be considered as a job be it part time job or full time. You can only use gambling as a fun place it will save you. Otherwise you will succumb to greed and become addicted to gambling
I agree with your point of view totally. Gambling is so luck dependent that you literally need to be lucky to pull through on every stake, even the most skilled and knowledgeable person sometimes, turns out unlucky and probably end up loosing their funds to the casino and sometimes in the bid to probably win back, you become addicted.
I usually advised that it doesn't matter how skilled you may want to consider yourself to be, it's very important you don't at any point turn dependent on gambling as it will definitely disappoint you in the long run, except you are lucky to have a big win that makes up for your losses over the period of time, but then it's not ideal to ever see gambling as worthy of a job opportunity because it's not sustainable and it will definitely disappoint you in the long term.