I agree, if we aim for the profit in playing gamlbing it is quite hard to say it will be profitable but if we talk about the removal of stress so we can be productive in our next weeks work, then we are talking about gambling activity being profitable for us. With less stress we can do our daily job precisely, less mistakes less need to do the task again. It will save us more time and do alot more than being stressed. This is the part where gambling (as stress remover) gives us benefit.
There are many things that can do to be our stress remover rather than gambling. How come we risks our money here just because we want our stress to be removed. I don't believe on that kind of reasons why people do gambling. It's impossible they are not expecting profits in return.
Id rather spend money on drinking sessions with my friends than to risk stakes at gambling.
If we aimed to earn then gambling is not really on the options but some take the risk for they might feel lucky that they can win at those times, not knowung it can be the start of their addiction if not being controlled will be reciprocal of what they wantes to earn.