http://developer.garmin.com/connect-iq/monetization/
mentions using web services for subscriptions and in-app payments, or selling ANT+ hardware. However that would require Communications permissions for web services so can only applies to apps and widgets, Sensor permissions for hardware devices which apply only to apps, widgets and watch faces.
So what is the suggested way to monetize a Data Field, given that charging in the Connect IQ Store is not supported?