The purpose of bitcoin is that the user controls it. It's about trust. Do you trust a bank with your money? Cypriots sure found out the hard way when their bank accounts were suddenly frozen. Do you trust a government with your currency? Argentinians sure don't as they're experiencing 10-20% inflation rates. Bitcoin allows you to store your wealth without being fleeced by currency controls of parasitic central banks. It's refreshing and quite profitable.