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.
Exactly, gambling is not a job but nothing more than an activity that will only be useful to fill boring empty time, so it is clear with this then of course gambling cannot be used as a profession to achieve success, and after all, as you said, the results of gambling are always "hit and miss" or meaning nothing more than a "possibility" which is the name of the possibility will certainly not always be able to happen, which means this is the reason why sometimes you win and sometimes you lose.
This is also the reason why gambling is called an activity full of uncertainty, because there is absolutely nothing that can guarantee you to actually win, while success is when you are involved in a field that has improvement or has the potential for development to become better or more knowledgeable that can give you certainty in terms of earning regularly at the end of the journey, but gambling does not work like that, there is no experience that you can learn anything other than victory that only comes "occasionally".