There are predatory laws in place to prevent competition.

For example, there is a law that you have to cover 98% of a town to provide service. This means you have to cover areas that have very little need for service. Companies like Comcast can get around these laws, but towns that want to provide their own service to their citizens or smaller ISPs have difficulty.

There are other laws and hurdles as well designed to protect larger companies like Comcast from any form of competition.

These larger companies have also work with each other to prevent overlap and raise their prices consistently.