Bitcoin: store of value. 
Yes store of value and medium of exchange just like a baseball card.
Except more durable, more fungible, more divisible, more easily transportable, harder to counterfeit...
Stop calling it currency 
What's it matter, anyway?
Because if you can realize that bitcoin is not currency because it is not a UNIT then you can realize that the US dollar is not currency because it is not a UNIT.
That is what Ron Paul is really asking Ben when he asks can you define a dollar for me. He is really asking what is the UNIT called a dollar equal too?