This price of BTC is irrelevant to its function as a currency. If you believe it to have been an investment, that's your gamble.
As both a merchant and investor in the Bitcoin economy, the price DOES matter.
I am only exposing one of my 3 businesses to Bitcoin.
When the price was above $16 US, I offered 0.5 BTC per kg of my product (beef) (10% discount)
When the price was above $9 US, I offered 1 BTC per kg of my product
Today, I changed the price to 2 BTC per kg.
With a shit house derivatives market, I MUST keep changing my BTC price. That pisses me off no end.
Personally, I think I BTC = 1KG of prime beef, but my bottom line will not take it.
The price discovery phase is still in motion and I expect something as radical and AWESOME as bitcoin will require at least another 6-9 months for the real trading to begin.
Around about March 2012 which almost ties in nicely with the reward reduction to 25BTC.
This doesn't say price itself matters, just that price stability matters.