If the revenue split was really what's keeping Amazon off the Apple TV, they wouldn't have had an Amazon Video app on iOS devices for the past several years.
Only Bezos knows what's really going on in that head of his...
There is no logical argument for the Apple TV not having Amazon Prime Video.
The Xbox, with a much larger audience than the Apple TV, has an app that doesn't have the ability to buy/rent other videos, which is the main point. Also, they're fine Google taking 30%, but not Apple?