> Wasn't there something in the news not too long ago about an investment firm that ran this way? :)
Only if there's also a continuous stream of people who are drinking without paying. If, out of a sense of community responsibility, people pay in close to what they drink (or a little bit more), then this system works.
Yes, but that is kind of what posting the image without a barrier to entry kind of guarantees, no? I guess that is the 'experiment'.. It would be more interesting if there were two cards, one public, one restricted to HN members or some other subset of 'public'.