Large content providers, for one.

Basically, any business that uses the internet as a primary tool could spend to boost their priority with ISPs. That benefits basically any big company while screwing us because we can't choose a different ISP.

If net neutrality goes away, then incumbent corporations with existing foothold and ISP partnerships may get a monopolistic-like advantage.

Ah, good point. I wasn't thinking about the Corps with existing partnerships.

It's also the corps with money: Pay for preferred treatment and raise the barrier to entry for any competitor. Given how Microsoft reacted when they saw their greatest enemy as "some kid in their garage brewing the next killer app", that's a very real concern.

Anyone with cash to negotiate with multi-billion dollar ISPs for rates will like this move. They can buy top quality service (hypothetically).