I'm not too sure. Netflix has one hell of a popular product. And that gives them leverage. The ISPs have a product too, but it's nowhere near as good as other countries around the world.
When you have a popular product, you have customers on your side, and that's a huge boon for Netflix.
I agree that our bandwidth to price ratio is shitty in this country. But until we have viable competition in THIS country, our rates won't come down. John Oliver's rant on Net Neutrality (ironically on HBO) sums this up pretty nicely: https://www.youtube.com/watch?v=fpbOEoRrHyU
When you say "bandwidth to price ratio is shitty in this country," are you in a country where you pay $79.95/month for 250GB quota on ADSL2+ which connects at 6Mbps?
We're in a country where we pay $50/month for 150GB quota on ADSL2+ which connects at 5Mbps.
There's a $10/50GB overage charge. So if we were to hit the quota you have, we'd be paying roughly the same ($70/month). Note that the price listed does not include taxes and fees, which bump it up to within a few dollars of your $79 price point.
When you have a popular product, you have customers on your side, and that's a huge boon for Netflix.