But their upload is throttled to 0.4 or 0.8 Mbit/sec, and with this monthly limit, their -average- download is limited to 0.8 Mbit/sec. If you download constantly at 0.8 Mbit/sec for a month, you get about their planned limit of 250 GBytes downloaded that month.
For about the same cost, I get 5 Mbit/sec down, 2 Mbit/sec up from Verizon FIOS (these are the slowest speeds they sell.) These are real speeds; I run that way all month long sharing Linux and other open source software via bittorrent with others.
Speeds of essentially 0.4 Mbit/sec to 0.8 Mbit/sec are just not competitive at the prices they are charging and they are having to misrepresent this using what resembles the "peak audio wattage" numbers that cheap audio equipment uses to sell underpowered equipment. Their 6 or 8 Mbits/secs are essentially inflated.
If Comcast didn't have a near monpoly on cable television to a bazillion households, then their internet service product would not be competitive.
In my area.. Comcast is a monopoly. they control the cable access here.. Verizon is trying to get into the game in Portland, OR. but it will not cover the whole area.. like where I live.
Comcasts arguement about customer bandwidth narrowing is hallow. For the ammounts that Comcast charges.. they can easily upgrade their infranstructure in all markets easily.. but refuse to do it in the name of profits.