This thread might be a good place to ask: Why is enterprise bandwidth an order of magnitude more expensive than residential bandwidth from the same company, delivered in the same way?
So the service targeted at these price-insensitive customers gets them more regular status updates during outages, dedicated account managers, etc. that your residential customers really don't care about(their boss isn't going to chew their ass out when their personal Netflix goes down, but they will if the business and its 400 employees shuts down). The residential customers only care about the value/cost - they don't buy redundant backup internet, run their own automatic backup power generators, etc.
Businesses are like first class and consumers are coach on the same flight.
Anecdotally, a few months ago, there was a transformer-caused fire a couple of blocks from my home that burned a telephone pole, disrupting power & internet service to a few city blocks of single-family homes. Crews were re-routing power as soon as the fire was out, and the ISP crew worked through the night to replace the pole and restore internet service.