Yea, nice one, haven't read this argument thirty times in this thread already. All currency is tulips, if everyone agrees that the USD is worth nothing, then by all means it is! People are placing value in BitCoins because it is an incredibly convenient currency. As a poster put it upthread a ways, it costs some people more per dollar to accept USD (through Visa/PayPal etc.) than it does to accept BitCoins and then convert those BitCoins into USD.