why bitcoin rise?

any idea?
This guy, Mr. Kavasaki... asks some of the dumbest questions that I have ever seen... but surely, a trolling style to provoke responses.....
Actually, I believe NO one really knows why BTC prices go up or go down.. and it seems to be a momentum thing to some extent... certainly, there is enough big money involved in bitcoin, that if there were a will, there could easily be a 5x increase in prices... whether sustainable at that 5x increase, may be another story.