I don't know much of anything about company valuations, but in terms of what the following two companies mean to <i>me</i> and what I believe they means to the <i>world</i>: if Dropbox is valued at $8B, I no longer have any reservations whatsoever with Tesla's valuation based on its stock price. (I do recognize that its price is being corrected this month, but I suspect it will eventually trend back upward.)<p>From my point of view, Tesla brings me at least ten times the value of Dropbox. I don't even think Dropbox represents a problem that should exist long-term assuming a re-disintermediated Internet, which is where I am optimistic we're heading eventually. Storing and sharing my data using someone else's service is retrograde.