That's the problem. Uninformed comments like this. My typical "day" at home may include 1-4 full length movie downloads via Roku and\or Xbox360. Possibly a game or 2 downloaded on the 360, as well as a couple of South Park HD episodes. I also LOVE my ITUNES, try to back-up my files on a regular basis, and I may watch a little Megarotic from time to time.
Then it's obvious that Comcast does not meet your needs, and you should take your business elsewhere.
250 GB per month is more than adequate for the vast majority of Comcast's customers.