Being told "professional poker doesn't contribute to society."

[Lyric]

Even people who do not object to gambling because of moral or spiritual beliefs often come up with this one. Anyone have a good answer? Shouldn't you quit poker now and run off to become a doctor so that you can "contribute to society?"

Greenstein has obviously decided he doesn't contribute and has decided to give to charity, but I think pro poker contributes by itself -- it's just a little difficult to explain.

Give it a shot.