Business Insider's Tech Chart of the Day, every once in a while, delivers some nice insights. Spotify reportedly reached 10mn paying subscribers in 2013, up from 6mn - but with more subscribers came more loss in the past years. And the same goes for Pandora. The more revenue they generate, the more losses they report. Would be interesting to see their cost structure besides royalties (at least Spotify claims to give 70% to artists).