dear porc,
as gold is bitcoins are a store of value before beeing an everyday currency. Why? because people like to be safe: if you are very rich you do not trust in banks or goverments, you hoard gold aside of other assets but you have to build a caveau if you want to keep gold safe and someone can still steal it. instead you can hide several copies of your btc wallet everywhere. That's why cryptocurrency is the MOST safe value store ever. Probably btc will never be everiday's money just because it's a too good value store, that does not mean it will not grow exponentially in price.
http://en.wikipedia.org/wiki/Gresham%27s_law