Do you really think a Home Cable modem connection could be worth any more than an absolute MAXIMUM of say $300 per month?
(not that I agree with any over charges)
Pretty much. See a month is a finite period of time. So with a 15mbit connection, at an overestimate of 10 cents a gigabyte, you would pay a max of 475 dollars a month. If you use a more reasonable cost of 1 cent a gigabyte it only costs a max of $47.50.
But ISPs don't buy metered bandwidth from anyone. They just buy bulk symmetric connections. So there is no real cost per gigabyte anywhere in the system. It's just invented. There is no real cost per usage.
That is why fixed cost lines make sense. As bandwidth has nothing to do with the cost. The cost is the wires and the equipment connecting the wires and the maintenance. These are the same for everyone no matter how much they use.
