The days of paying for something in the App Store and using it are a part of history, at this point. You can blame a race to the bottom which means people won't download an app or game unless it's free for that. But developers still have to make money, which means in-app purchases and, more pertinent to this piece, subscriptions.
Now don't misunderstand my point here. I'm not saying that subscriptions are bad. Far from it, I think that they are an ideal way for developers to ensure that they get recurring income. In a world where people expect their apps to grow with them, gaining new features as they go, recurring income is vital.
