The cost comparison should be with a plug that delivers 11kw. That’s going to be a lot more than zero dollars.

Nah. A single good 220 outlet is sufficient for keeping three actively used EVs well charged at home. We use a middle range one (40 amp, not 50) and it supports three cars easily. With 50 amp it would be even easier. Most houses come with these already installed.

Hell, a single good 110 outlet ("good" meaning higher amp, like a kitchen or garage outlet) is sufficient for keeping two actively used EVs well charged at home if Superchargers are available as a backup.