Currency can have its own features that make it worthwhile. No matter what happens with btc's popularity, as long as I have one other party to trade with, some features will be available to me through btc that are not available through normally denominated national currencies. Can't I buy btc because I think these are valuable features and their desirability will drive interest and users, just like I would buy Google because the desirability of its features drives interest and users?
