https://marco.org/2008/08/25/does-this-mean-that-i-can-charge-for-updates-if-i
Does this mean that I can charge for updates if I want to?
Can I charge a different price for updates than I do for new licenses?
This would be an interesting way to fake a subscription payment model if Apple and your customers were cool with it. You could have a timebombed app that stops working 2-3 months after you build it, then issue paid updates every month. Of course, a true subscription billing capability would be a lot nicer.
While I don’t like the idea of having to pay $2-7 per month for dumb games (cough), the pay-once-and-use-it-forever model can’t necessarily cover developers’ costs of some apps, such as those that depend on a costly-to-run web service (e.g. Instapaper).