Currencies are not goods and should not be thought of as goods. They are mediums of exchange[1]. They may be backed by goods (such as gold), but currency itself should have no inherent value (otherwise, it's a terrible medium of exchange).
What you're talking about are securities[2]. There is a distinct difference. Bitcoins are ostensibly a security masquerading as a currency.
No, I think I am correct. Currency exchange rates are prices and in that sense a currency is a good. The typical use of a currency is as a medium of exchange, but people use goods for different reasons. That was my point originally.
What you're talking about are securities[2]. There is a distinct difference. Bitcoins are ostensibly a security masquerading as a currency.
[1] http://en.wikipedia.org/wiki/Currency
[2] http://en.wikipedia.org/wiki/Security_(finance)