This point is moot as we both agree on your previous statement, but let's continue for the sake of examination.
Purchasing the additional bandwidth from their upstream providers is not the only issue.
Actually bandwidth costs are pretty linear the first 50 dollars a customer pays for all the customer service maintenance taxes etc. After that were still talking less than 15 cents per gigabyte and comcast is a transit carrier as well. I have OC3's from both Comcast and Time Warner in use around the country.
That being said if they think they're going to charge 1.50 per gigabyte I will begin to organize an effort for government regulation of overage charges. I will not see a Enron of the internet rise to power.
At their prices it would cost hundreds of dollars for any decent online backup.
They would of been more resposible to put no hard caps but tiers above certain usage. Is 100 dollars a month so terrible for a user that might download a few thousand gigs of data legitimately?
What then for companies that provide you services. Comcast would be able to outprice them on virtue of they control the cost of data now. So a HD download from Apple could cost you 9 dollars on top of what Apple charged. How is that fair for Apple?
This is net neutrality at it's core. They were stopped from charging content providers and now they figured it out that they can charge you and get away with it.--