If you really most gamble, you need to work harder in other to secure your future and your gambling expenses, since you are not expected to use the money of your personal needs or other expenses to gamble, therefore working harder gives you the edge over any unforeseen gambling expenses that will rise later, if you want to be a successful gambler, actually, it doesn't really means that only gamblers should work hard, but for these set that feels they needs to work harder are called responsible gamblers because they know how important their gambling activities is and their personal expenses is and does not need to be mixed up together and they know that gambling is for entertainment unlike those that feels it an avenue to make money and start borrowing to gamble, those set of person of gamblers have a wrong orientation towards gambling.
What should qualify someone to gamble is when their have extra cash to gamble with, this way their have less pressure to win at all cost, and also they won't be in debt when their encounters loses along the line, this is what we have to put into consideration when we are gambling, so yes working extra harder becomes a must if we must keep gambling at all since we already know the financial implications of gambling.
Not everyone can control themselves after losing in gambling because after losing in gambling they always think about how they will recover the lost money. Gambling does not bring joy to everyone. I think gambling is okay for those who gamble for entertainment. There are some people in our society who have lost all their money in gambling and become destitute, for them gambling should be completely banned.