I saw a McKinsey report claiming that higher-powered chargers are very profitable. They charge more per KwH, but the charger operator doesn't pay more per KwH, and more cars per day can use the thing since charging is faster.

Shell is now into charging stations. They figure that if it has a big hose that fuels a car, that's their business. If Tesla doesn't want to be in the charger business, they could sell the business to Shell.