I really don't get Bitcoin. What is the point in a currency that ranges from $2 USD to $12 USD in a year ?
The value of the currency doesn't really matter to those of us who use it - It could be 1 bitcoin to 1 USD, or 1 bitcoin to 10 USD - as long as the downwards volatility is kept to a minimum. What's problematic is when you buy something worth $50 USD with 5 Bitcoins, and the Bitcoin to USD drops before the seller can get their USD from MtGOX (or whoever their Currency Exchange house is). The upwards volatility isn't a…
If BTC is rapidly rising against the dollar, then I'd rather spend dollars because I'll want to keep the BTC in my account in anticipation of further appreciation.
And, for that matter, the fact that the entire conversation is framed this way doesn't bode well for BTC as a currency. People who use a currency as a currency measure its rises and drops in value by comparing what you can buy with a given amount of the currency in the present versus what you could buy with the same amount of that currency in the past. When people measure something's value in terms of some other currency, as is the universal practice for BTC, that indicates they're thinking of it as a commodity for investment or speculation rather than a currency.