Earlier quoted context omitted.
One guess would be that they didn't want a 3gb app constantly being downloaded by people who wouldn't use it for more than 30 seconds. I realize bandwidth is incredibly cheap, but we are always hearing talking of Apple trying to offset costs, maybe this factored into the thinking?
Seems like a reasonable guess. However, considering how large the update downloads are for even minor upgrades of Apple software I always assumed Steve secretly owned stock in a CDN.
http://www.akamai.com/html/about/press/releases/1999/press_0...
It was at one point worth about 2 billion dollars, but I'm guessing it all got washed out after the dot-com bust because word of it was never mentioned again. :-)
Anyways, they aren't doing this because of CDN costs, it's negligible -- they are Akamai's largest customer and are also building their own network as well.