[Kurn, son of Mogh]

My poker play supplements in a meager way my income as a clinical psychologist, but in no way benefits anyone.

Not true. By supplementing your income, you create more disposable dollars. By spending those dollars, you add to the overall value of the economy. If you invest those dollars, the bank now has additional funds to lend to businesses. In addition, you contribution to rake contributes to another industry which in turn spreads value to other people.

Every dollar earned and spent and saved has a downstream economic value. Your primary responsibilty to "society" is to take care of yourself and your family. As long as you're doing that, you are holding up your end of the social compact.