Come to think of it.. it's really just amazing how the price of Bitcoin got inflated and is at 15$.. It's just pure speculation, no one spensd the Bitcoins at all (ok, maybe a very few people).
It's really just waiting for the first trader to realize Bitcoins aren't worth anything at all actually, since no businesses accept them (and businesses don't accept them because there are no customers anyway). When that happens the price will probably nosedive.. It's quite important to get some substantial 'bitcoin consumer'-base before that happens.
Not worth anything? How do you figure that? Just because they are not useful for what they were intended to be (a currency) does not make them worthless. They have value for similiar reasons to fiat currencies. They have value because people agree that they do. If people did not agree that they had a value, then they wouldn't have any. Of course fiat currencies are a little different, since they have a government behind them, telling people they have no choice but to accept them as valuable, how much value they have is still up to the market.