I've got a friend who does it simply to fuck PG&E and avoid an electric bill. He has workplace charging, a Cybertruck, and a powerwall + Tesla solar setup at home. He drives his truck to work, fills up on electricity, drives it home at the end of the day, and uses it to power his house. Repeat the next day. The Cybertruck was cheaper than the 13 PowerWalls or whatever that's the equivalent battery capacity.