Do you feel that Apple should get 30% of any sale that's made from said app within Apple TV?
That seems to be part of the sticking point. It isn't as simple as Amazon won't let you you use it everywhere you want...it's that Apple wants a significant cut to let them do it.
I'll never understand how consumers, even if they are Apple fans, will blindly defend a 30% Apple tax on things like monthly subscriptions or in-app purchases for content delivered through multiple sources.
I don't think any of us are in a position to absolutely state that 30% is too high. That said, I don't necessarily disagree with you either. The issue is a comparison of the value-add from Apple versus the value of Amazon.
Apple provides the infrastructure and support, takes care of billing, and is the glue that links everything up. Amazon provides the app and the content. What is the real value of that?
There have been several posts about this but it bears repeating: this is
not about accessing the
subscription content on Amazon. This is, instead, 'all about the paid content'. Rentals and Purchases. Amazon wants to be a central provider of content ownership... and that is absolutely reasonable on their part.
Apple has not (or at least has not publicly) stated that any competitor is unwelcome. That applies to both Amazon and any of the UltraViolet front-ends (Vudu, Flixster, etc.). All Apple has done is state that they will take a 30% cut on any content purchased via an Apple device. Amazon, Vudu, etc. are all welcome to compete directly with Apple by having an app capable of making purchases and/or renting. They are also welcome to complete indirectly by having an app that only provides the front-end.
If Amazon truly wants to compete with Apple on the value of the service, then they should enable the Apple TV and publish numbers on subscription content, rentals and purchases that are watched on the device. If that number gets high enough - particularly without Apple getting a cut - then Apple will be forced to compete on price and quality. IFF Apple gets a cut - even a small one - then the market remains at status quo. This applies equally to UltraViolet providers.
For my part I would much prefer to at least be able to access all of my content from a single device and don't particularly care if it has to be purchased or rented elsewhere.