Cost is the determinative factor in price only for public utilities and other socialist horrors. Here in the land of freedom, you will pay what the market will bear, and that’s proportionate to how much value you receive.
If you only send the occasional email, any price at all might be too much - you’ll just send them at work, or the library. If you regularly upload full-length movies, you’d better have a fiber optic connection, and you’ll happily pay extra for it.
So it’s not that “bandwidth hogs” are harmful; it’s that they would be willing to pay more than most of us. The problem is that TWC (or whoever) then tries to market the Gb service to everybody, at the Gb price. Then they want to not actually deliver that speed, because you’ll never notice. And then the guy who really uses what he pays for is a “hog.”