Using bitcoin as currency makes no economic sense. In the same way that using a foreign currency in your own country makes no economic sense. That's because u

Using bitcoin as currency makes no economic sense. In the same way that using a foreign currency in your own country makes no economic sense. That's because using any other currency other that the local currency incurs transaction costs (not to be confused with transaction fees) that could be avoided by using the local currency. So people who use bitcoin as currency tend to do it for ideological reasons or to prove that it can be done. There's nothing practical or economically advantageous about it.