It is obvious why! I actually buy Tesla every monday and sell call options 5 points in the money and cash out on Fridays. I know if the stock falls one point, there are analysts and the google boys, Musk and big money that will support it. I also own apple, and I know it will not make a difference if the stock trades at a PE of 1 with 500 dollars a share in cash. The people that need to support the stock are too afraid. They have almost 150 Billion dollars in cash and they do not do anything with it. If Tim Cook turns around and says they will purchase 50 Billion dollars worth if stock GUARANTEED, that may support the stock. Since they mentioned their numbers will come out on the high end of the estimates, the stock has fallen about 10 points (they announced after they mentioned they sold 9 million phones and the stock was at 488 pre market).
By the way, my personal opinion is that Apple is ridiculously undervalued, and Tesla is beyond ridiculously overvalued.