Here's an interesting report from Juniper Research. According to their work, mobile app revenues will reportedly grow from the current US $6 billion to a whopping $11 billion by 2015. And the majority of that revenue will come not from the standard download fee, but instead from in-app purchases, according to Juniper. The firm claims that in-app purchase revenue will top one-off download fees by 2013. That seems hard to believe, given my current anecdotal usage, but there's no question that in-app purchases are growing by leaps and bounds as a form of sizable revenue for app developers.
Jupiter's repo
