Bandwidth isn't cheap if you're away from a large metropolitan area. Our prices are somewhere near $3k per gigabit circuit, but you can do 10gbit for like $6k. Cogent and HE are dirt cheap if you can get them, but Cogent is garbage and HE isn't always available.
Netflix is a serious strain on our networks. It only takes 75 subscribers streaming HD concurrently to eat 500mbit. Do the math. 75*$6=$600, but our cost on that bandwidth is $1500?
It hurts. Don't blame the ISPs though. The entire ecosystem is designed to screw anyone who can't get multiple 40gbit+ circuits.
edit: had netflix at $7 not $8
Might I also add that a year and a half ago we were still paying $2000 for a T3?