I agree, it's a really complex interaction. You have to consider: 1. The number of users that would never pay for your app, but are happy to download it for fr

I agree, it's a really complex interaction. You have to consider: 1. The number of users that would never pay for your app, but are happy to download it for free. 2. The number of users that would never pay for your app without trying the free part first. 3. The number of users that would pay for your app without trying it for free. You then have to consider the amount of revenue you lose from Type 3 to support Types 1 and 2. Hopefully you come out ahead, but you may not.