Quote from site
"Several weeks ago Professor Aswath Damodaran of NYU posted a detailed valuation of Tesla Motors Inc that I discussed with him and examined carefully.  In a previous post, I noted that Aswath made a host of highly optimistic assumptions regarding the future earnings performance of Tesla Motors Inc.  Despite the optimism, however, his value indicator fell short of $70 per share.  At the time, Tesla Motors Inc was trading at $160.  Friday it closed above $190.  This leads to a very interesting question – who was buying Tesla at $190?  There are two basic possibilities."
Read more via the link below. 
http://www.valuewalk.com/2013/09/tesla-motors-inc-tsla-is-the-next-apple-inc-aapl/