This is really cool, but I'm curious how an investment in this is different than a charitable contribution. The contribution is awesome for the network it introduces Watsi to, but I can't imagine there will ever be a return on this kind of investment. (This is not meant to sound negative. I am truly excited to see it, interested to see what the YC network can bring to it, and very curious about the investment thinkin…
There is no difference; it is simply a charitable contribution.
Hopefully it'll quickly join the ranks of the larger crowdfunding non-for-profits like Kiva.org, Donorschoose, etc...