Some whale is algo-trading to maintain the price. Whether or not he was responsible for the jump at $450 I have no idea, but this is just complete nonsense.
lol, why such hostility? No more cheap coins brah... sorry brah.
Because the price is being manipulated as it is so easy to do. For example, banks can buy as many coins as they want because of their ability to leverage (print money). They can always maintain enough of the coin percentage to have control over the exchanges, and thus the Bitcoin price.