Tesla is a meme stock. Its being buoyed up by retail investors (Elon Musk fanbois) and, its been said, by Saudis and others who were trying to curry favor with him (possibly to try and get Trumps ear or other greasy bullshit). The stock is completely divorced from reality, which also attracts further investment--as long as its disconnected from the fundamentals of being a company that has to make a profit, you can argue its worth 100 million billion dollars or a googel, both are just as valid.