I haven't seen anyone taking up gambling as a career but I have seen many taking it up as a pastime to spend their free time. To make gambling as a career, regular income from gambling must be possible, which is not possible at all from gambling. So no one wants to accept this uncertain possibility as an integral part of life. If there was a guarantee of payment, maybe many people would take up gambling as a career.
Your statement is very right for this because it would be very ridiculous if someone starts making gambling a career for a certain period of time with the condition of not being sure of winning every day. But if it is meant for gambling service providers such as bookies and others, of course it makes a little sense because they will definitely get more profit than loss from it. But for individuals who only use gambling services, I think it is more impossible because there is no win for the same person every day in a gamble.
Basically and overall gambling is an activity that cannot be predicted 100% accurately, meaning there is no way whatsoever to base the reason why you win or why you lose, everything happens randomly and without you knowing the reason, meaning of course how can you make a place that runs without any certainty and guarantee to always get victory as a place to have a career.
This is a high-risk activity which is added again as I said above that there is nothing that is the reason why you win and why you lose, meaning how can you build a successful career in a place that runs randomly and which only depends on luck to be able to produce victory, this is a business for the casino, as you understand, meaning if you are nothing more than an ordinary gambler then in the long run you will only lose more money especially when you have an approach that tends to be excessive.