My thinking is that if bitcoin becomes a monetary standard for online commerce it's orders of magnitude undervalued. If not, it's probably overvalued. So it's a perfect asymmetric bet. The most you can lose is the price of buying a few (or many) bitcoins. The most you could win is 100x or maybe even more. It's kind of like making an angel investment, except that instead of investing in a single company, you're investing in an entire economy. Imagine if instead of being able to buy shares in Pets.com or Altavista in 1995, you had a chance to buy a share in the Internet as a whole. That would have been an awesome asymmetric bet