"A natural monopoly is a monopoly in an industry in which high infrastructural costs and other barriers to entry relative to the size of the market give the largest supplier in an industry, often the first supplier in a market, an overwhelming advantage over potential competitors."
When there even is any competition. Where I live, it's literally Comcast or else tether my mobile phone. Satellite is technically an option, but realistically between the cost and my tree coverage there's no way to make it work.
Lots of ads, undercut your competition by something like $1 and "new customer deals" and then shaft your customers after a while
The average customer just go to the store with the flashier lights (or the one which is more convenient)