Kaioshin-sama mentioned earlier that speculation about KyoAni's revenue stream is pointless if we don't have the numbers. He does have a point....therefore, here's an article written by my Nihon Review colleague
Akira, who did manage to get access to the relevant numbers:
[BtNHRV] The Rise of the New Guard
It's not just the revenue gained from sales; it's KyoAni's entire business model. Really, their source of their strength is also their Achilles' heel.