Flash mobs for not only fun/doing good, but also profit? This doesn't sound like something you can get wealthy doing, but if you have other priorities, seems re

Flash mobs for not only fun/doing good, but also profit? This doesn't sound like something you can get wealthy doing, but if you have other priorities, seems reasonable. Does anyone have figures/stats on how much of an impact social or "web 2.0" for-profit do-gooders are having?