This social and economic cafe experiment by a Seattle Googler is fascinating, especially because it’s actual appears to be working so far to generate enough to keep the business going. There are no prices and people’s contributions are not monitored. Thus even the normal social pressure you’d have with, for example, a church collection plate are largely absent here in the Kirkland Cafe.
I’m totally skeptical of this model as a scalable type of business, but it’s sure interesting. Burning man sensibilities come to mind.