Could Apple have it's own TV channel? Or Maybe just their own advertising agency for ads on the iOS devices, internet and TV.
Well this article seems to touch on the subject. And it's a good read.
iAd and the Apple Broadcast Network

And here is a nice fact.

In the first 27 years of TV in the USA 67 million TVs were sold roughly.
But in the roughly 3 years Apple has sold roughly 75 million iOS devices. And that is without the 2 million iPads. I know the 75 million is world wide but I think you get the idea. There is major potential here.