Hence the growing trend of bandwidth limits. My local (and only) ISP is the cable company. They have a 100Gb monthly limit with $1.50 per 1Gb over that. Pretty easy to run that up watching Hulu and Netflix a lot.
If you demand 1080p with 5.1, yes, caps go quick. Give me free 480p and I don't care. If you can't stand it pay for a higher tier/better service. For you, a PVR would make sense.