I have never read up on app business models but intuitively I'd say in app purchases create unneeded extra friction. Additionally if you pay up front you have a

I have never read up on app business models but intuitively I'd say in app purchases create unneeded extra friction. Additionally if you pay up front you have a sense of ownership. My guess is that I'd only use freemium when network effects matter. The app described in the article doesn't rely on network effects at all but it's nice to see my gut instinct corroborated experimentally. I'd be interested in seeing this repeated for Android because I'd suspect iOS users are generally more likely to buy stuff.