Why the Amazon App Store sucks and you should stick with Apple
ioshero.com
ioshero.com
Subsequently, with the number of sales the first generation has allegedly received, it seems like a much larger issue if the app were to gain any popularity or be promoted on Amazon's storefront. Amazon has valid concerns and is just attempting to guarantee at least function on a very limited number of devices. It's hard to find fault with that.
The advertising cost wouldn't produce a positive pay-off for an app of that variety.