Where did the VCs get the money from [1][2]? If they didn't break a sweat, they won't hesitate to throw it around without asking questions about profitability.
EDIT: People who are downvoting are trying to hide the truth of the market, whether it's a bubble or not, this is the source of the money and in turn, your livelihood ;)
[1] Probably from banks who got it from the gov't who got it for cheap, right?
[2] http://agilevc.com/blog/2014/10/29/where-do-venture-capital-...