After averaging $5.00/day for a year with my iOS app using a freemium model ($1.99 in-app purchase), I decided to switch to a paid upfront model just to test. I

After averaging $5.00/day for a year with my iOS app using a freemium model ($1.99 in-app purchase), I decided to switch to a paid upfront model just to test. It resulted in a sustained average of $25/day. That's a big deal to me and so counter to everything I read about freemium being the only way to go in today's mobile market.