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Interesting experiment in that the image is public with no signup/restriction to get at it. You would need to have a continuous stream of new "pay-it-forward" users to add money on the card, no? There are lots of coffee drinkers in the world... Wasn't there something in the news not too long ago about an investment firm that ran this way? :)



> 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'.




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