https://bitsharestalk.org/index.php/topic,22125.msg288854.html#msg288854
So it's just a case of alt-coiners not knowing how to value companies and chasing a very tiny % of the total supply.
It's also a non business model.
Question: They're paying users for content. But where does the revenue come from to pay them?
Answer: While often in the red for a while, traditional business models attempt to earn revenue to pay for expenses and the remainder is profit. In Steem there is no revenue source only massive expenses in the form of having to pay users for content.
In theory the currency itself could ultimately bootstrap and organic demand could be created that way, enough to offset their huge costs, but given the centralised nature of the initial distribution I think it is unlikely that it will be widely popular and adopted.
(Synereo by contrast does have a business model in that advertisers pay for content like traditional social media sites but this revenue is mostly distributed among the users themselves in return for their attention. So when Synereo attracts users their value should go up, with Steem each new user is just an additional expense.)
I'm impressed it got to such a high value though and the lead dev/founder is one of the most talented around, so who knows.