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.