Monetisation and Supported Devices

Hey guys,

Looking at getting a merchant account and monetising one of my apps and I have a few queries.

1. Workflow for an already published app
Do I need to completely re-upload my app to monetise it?

2. Non-supported apps
What happens with devices that aren't officially in the supported list? https://developer.garmin.com/connect-iq/monetization/app-sales/ Currently it looks like over 70% of my currently installed base wouldn't be able to buy my app? 

If that is the case, is there any plans to add more devices to the list? I have to say, $100USD a year is pretty steep, especially when considering the suppoted device list and taking a 15% cut of any sale? 

Cheers,
Matt