Consider that despite today's drop, the stock price has gone up 4.6x this year (from $33.87 at year-end 2012 to around $155 right now), but over the same period the company's quarterly revenues have increased only 1.4x (from $306 million in Q4 2012 to $431 million in Q3 2013).[1]
The future of a young, highly innovative company like Tesla is so uncertain that shareholders have little choice but to rely primarily on speculation and emotion rather than on analysis of (limited) facts to estimate the present value of the business.
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PS. I'm a HUGE fan of the company and Elon Musk, and want them to succeed beyond their wildest dreams.
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[1] Quarterly financial results are posted on http://ir.teslamotors.com/events.cfm
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Edits: added third paragraph; grammar.