Marginal value versus total value, my friend. While those endeavors you mentioned would probably have enormous benefit once achieved, they are so lofty that the

Marginal value versus total value, my friend. While those endeavors you mentioned would probably have enormous benefit once achieved, they are so lofty that the marginal usefulness of a dollar put towards them is much less than the marginal usefulness of a dollar put towards a more modest goal. And it's worth noting that Groupon seems to have a social purpose that I'm not sure most people who aren't economists would be able to articulate: abetting price discrimination, and presumably eeking us closer to the efficiency in those markets that use it.