My impression is that the expectation for software quality and support is the same for a $1.99 iOS app and a $99 desktop app. Given that upgrades are always fre

My impression is that the expectation for software quality and support is the same for a $1.99 iOS app and a $99 desktop app. Given that upgrades are always free in the App Store (unless you go the Omni route), the cost different is probably even more skewed, and if your popularity continues (which is hard in the app store), your support burden will grow without additional revenue from those users. It sounds like you're an indie dev. You probably could charge more than $1.50/minute for your time ... so if you spend even five minutes supporting a customer, you're wiped out all your revenue (not even counting development time!).