Hmm, could it possibly have something to do with demand exceeding supply? Nah, couldn't be!
TIL Economics 101 is not a required class required for bona fide journalists.
Edit: I knew that already.
Effing SFGate will probably try to blame Romney, Soros, or the Koch Bros for it. Tomorrows headline: "Are the rich depriving the poor of their fair share of Bitcoins?"
As you mentioned. There really only is two variables that would affect this.
Either a reduction in supply, or an increase in demand. In this case, I think it's fair to say that demand has dramatically increased over the past few weeks while supply has relatively remained the same.