> you can offer essentially unlimited traffic to users hitting the cache, and still provide more limited access to other stuff. I'd prefer high bandwidth everywhere, but that isn't always an option.

If you are a small company trying to start an internet based business, I'm pretty sure you'd take "limited bandwidth for all" over "high bandwidth for the competition; limited bandwidth for me" anytime.

That is also the best way to ensure the 'lower bound' for bandwidth is kept as high as possible.