> While it does cost $99 to get in the store, the app can be used by millions for no additional cost. Hosting fees for a web app will grow along with the user

> While it does cost $99 to get in the store, the app can be used by millions for no additional cost. Hosting fees for a web app will grow along with the user base. Even without users, a domain plus a basic hosting plan will easily be more than $99/year. $99/year is just to host the 'client-side'. Most likely you still the backend so that cost is still the same.