Lastly , gambling is not a career and I have never seen any portfolio that bears gambling as an occupation or a means for livelihood.
This sums it all up. Gambling isn’t a job. On occasion, one can win some some money here and there but as it doesn’t come regularly and at a certain time and no one literally employed you, it just cannot be said to be employment.
And then talking about starting a career is out of the question. A job is supposed to pay you for your time or/and services rendered without you requiring you to part with your money. With gambling, you part with some money hoping to win and can still end up losing. Gambling simply isn’t a job.
Definitely, you are right about gambling not being a job, or a career and so on but you are wrong with some of the reasons you mentioned as to why gambling is not a job or career.
First, you don't have to earn or make money at any specific or stamped time or day, to consider something a career or job, there are some jobs that pays the worker at any time, it doesn't matter whether daily, weekly or monthly, you are simply paid at any time you accomplish a task set for you in the job, for example, I used to market products from different companies several years ago, and each time any of us manages to sell any of those products to someone, that person get paid his or her commission immediately, one could get paid two, three or even four times a day, depending on how many products he or she is able to sell out, and if for a whole month, you are not able to sell any product, you don't get paid.
And another example is trading, trading is a job, it's a career, and it can pay you at any time, doesnt matter at what time the day is, trading pays you anytime you trade and win the trade, you make profit, you can enter into as many as 10 trades in a day, and if you know what you are doing, you possibly can make profit in all of them, and you get your money whenever you want it instantly without delay, you don't have to wait till the end of the month to get paid.
So, the fact gambling doesnt have any specific time it pays a gambler, does not or isn't the reason why it's not a Job or a career, it is simply not a career because it not something one can depend on to make enough money from to take care of all of their life needs, and this is because, you are completely dependent on luck, your own efforts or skills, does not contribute anything to increase your chances of winning and provide some level of guarantee, nothing like that.