High demand of bitcoins because many invester here. And also mining too, when the bitcoins hit $6400 is it good to run a bitcoins in many years for now and i think btc strong on market.
Bitcoin have already PUMP so hard to $9000 per bitcoin right now, and yeah, that is because of our support to bitcoin, many people have turned their interest on it causing the bitcoin's population to grow even more and the demand of it got high affecting its price also to rocket up to the moon.