If it wasn't for their TV cash cow, we'd be paying three times as much for Internet. That is why they discount the Internet when you have TV.
Broadband is expensive because of infrastructure. Then there is not just the infrastructure itself but regulatory compliance, securing right of way clearance, and other costs are the reasons our broadband is expensive. And their pay TV offerings offset those costs.
Somebody has to pay for construction and maintenance of those lines.
I've experienced ImOn (when they were McLeod USA), Mediacom, Comcast, and Time Warner and I currently have DirecTV. They are much better than broadcast TV.
I have not and will not cut the cord.