I think there's a middle ground to be had though. For example, if the average user sends 1 article per day, offer 400 articles for $1.99, and in theory you have a recurring billing model that also doesn't require too much worrying from the user's point of view.
The other model might be $1.99 for unlimited use, and then release V2 of the app with new UI/features, and do an annual release model. It works for many apps, eg developer tools like IntelliJ. Would be interested to know if it works on app stores without getting grumpy user feedback though.
The other model might be $1.99 for unlimited use, and then release V2 of the app with new UI/features, and do an annual release model. It works for many apps, eg developer tools like IntelliJ. Would be interested to know if it works on app stores without getting grumpy user feedback though.