That is consistent with what I have argued in HN comments: with the glut of start-ups (50 from YC alone this year?) prices will drop towards replacement value. The replacement value of a start-up amounts to a hiring bonus for its developers. This is likely true even with substantial user traction.
We saw much the same thing in the implied valuation of iLike - after liquidation preference, developers basically get a hiring bonus, if they stick around. And iLike had 10 million monthly users on Facebook.
So unless a start-up has a plausible path to independent profitability, it is going to be subject to the brutal laws of a buyer's market. In other sectors this effect has been well observed: take enterprise software for example. There are public companies with $100+ million revenue that trade for basically not much more than cash on hand.