If they are both able to earn their own money, I think they can both continue to gamble. They can also share household expenses. I think there is a possibility that both of them might get out of control, but it is not a sure thing, and both of them can manage to act responsibly. I don't think it's right to have prejudiced thoughts against this imaginary couple. 
Yes but the problem is that they act in gambling and not other activities that really give certainty to earn, even though for example they already have a pretty good plan on financial management and gambling but on the other hand honestly I don't really agree if there are people who say that "it's okay to continue gambling" after all this is gambling which is nothing more than luck that can make them get results to divide the expenses of family needs.Honestly, I am one of the former active gamblers and I have my reasons why I prefer the couple to quit, we have to know that we are human beings and gambling involves things in the human mind such as hopes, expectations, emotions, I am not sure they will really be able to apply self-control and family bankroll management very firmly when both of them are overcome by emotions due to losing, isn't it possible for the couple to act out of control? Obviously, the most difficult thing for human beings to do is when they have to restrain their emotions not to vent, not only in gambling but also in other problems in real life is also the same, the difficulty of managing emotions that eventually act out of control.