Onemug - I think the confusion about the cost is that while the app is free to download from the Apple Store, a subscription to stream and download to the iPad adds $5 a month to your paid Mog subscription.
I don't know the answer about the streaming rate through the tablet app but can't find any information that it's any different from the normal rate.
The app is asking for your MOG account email and password since the two services are designed to be used together. Your Apple account and password would be only for use to apps or other content downloaded from the App store, not to access MOG content. If you haven't created a MOG account you'll need to do that before the iPad app will work.
I don't know the answer about the streaming rate through the tablet app but can't find any information that it's any different from the normal rate.
The app is asking for your MOG account email and password since the two services are designed to be used together. Your Apple account and password would be only for use to apps or other content downloaded from the App store, not to access MOG content. If you haven't created a MOG account you'll need to do that before the iPad app will work.