The general public doesn’t understand lithium battery cycle life.
$6k to connect a 100kWH+ battery to their house is a drop in the bucket to the $100k they paid for the vehicle, and compared to buying the batteries outright as a home backup option.
It’s the killer app right now for EVs and homes with solar. A Tesla Powerwall is like $13k for 10kWh. You’re getting something 10x capacity at a fraction of the cost.