The proposed plan for monetizing this relies on a misunderstanding (deliberately crafted by Apple) of the app store changes. If you obtain contact information from within the app, you can't use that information to steer monetization.

Here's a quote from the new policy:

> Developers cannot use information obtained within the app to target individual users outside of the app to use purchasing methods other than in-app purchase (such as sending an individual user an email about other purchasing methods after that individual signs up for an account within the app). Developers can send communications outside of the app to their user base about purchasing methods other than in-app purchase.