BitCoin is NOT a currency. Any business is rolling the dice accepting BitCoin with how volatile the price is. With how rapid the price swings (mostly down), no logical business would/should accept BitCoin. No different than gambling. To my knowledge my dollar last week is still a dollar today, not true with BitCoin, you would have taken a hefty loss this week only!
Actually, if you put it simply, BTC is more like stocks than money. The price fluctuates and your assets may lose value. It's price is driven by demand, like stocks.
Only, there isn't a company behind it...
And you can buy stuff. So it kinda reminds of money. What if you had Apple stocks, and you could buy a Mac with 0.5 of your MacCoins? Wouldn't that be money?
Oh, and your dollar isn't really a dollar... sure, the note/coin is the same, but it won't buy you the same amount of oil/gas/eggs/Euros this week and the next.
So, I guess dollars (and money in general) are kinda like stocks... right? Isn't that why you'd invest in a foreign currency?
Anyway, I don't really get the whole economy stuff, but I'm more interested in buying BTC than FaceBook stocks.
Hope my little brainstorming helps.