I am more interested in knowing why you (and some others like you) are always surprised about bitcoin price!
i mean have you even looked at bitcoin supply, ever? there are about 16.5 million coins mined. they speculate about 1-1.5 million belongs to Satoshi. and there are lost coins for many different reasons. that is about 2.5 million gone.
that leaves us with 14 million coins only. with all the recent media attention and the performance of bitcoin there is a lot more than 14 million people investing in bitcoin, even if every one buys 1 bitcoin, price goes to the moon. much more than $8000!