[oil pan 4]

The circuitry is a lot like a modern high frequency welding machine or plasma cutter but with way different controls.
With competition and more production the cost of these back feeding chargers could be cut in half, maybe.

Then there is the slightest problem where only chademo equipped cars can back feed power. Not even tesla can do that. I'm sure tesla has made a 1 off demonstration vehicle that does such a thing but those don't matter.

My little 10kw chadmo charger I bought used for $1,200 is $3,400 new. It was the 3rd one I saw on ebay in a year.
1 other one like mine and a full size 64kw unit that runs off 3 phase 480v power.
I search for chadmo on ebay a few times a week because I want a bigger chadmo that runs on 240v single phase.
My 10kw chadmo is rare, anything bigger that runs off 240v single phase is even rare among those.