With the amount of money they had raised, the expectation from investors was that their flywheel would already be setup and working and new funding would accelerate it (Series A being the new Series B).
Media coverage of startups is all at the pointy end - companies that have raised money and are successful, most startups don't raise continuing rounds and the "Series A crunch" is real. The question should be inverted, why should Everpix get funded.
Despite having a product that was loved, was free, had good word of mouth and coverage etc. they still didn't get funded. Not a unique or unusual situation, and only covered in this case (as opposed to the startups that die out quietly) since the founder was willing to speak to a journalist about it.
Could it have worked with no funding, a leaner startup and as a paid product? Who knows, but I wouldn't use their freemium numbers to make that case.
[0] http://andrewchen.co/2013/11/05/when-a-great-product-hits-th...