So, ignoring the fees involved in making it happen at all (which I assume the person did, because wow.) Say they spend ⅓ the price of the car to get ⅔ again as much use out of it. That’s a profit. They’re probably looking at replacing the car and not the battery when thinking about it, so it’s really good then. And they probably assume the device is transferable, so they can get more than one use out of the investment.
So they’re selling themselves on almost 2x performance that they can apply to all future batteries or cars and thus they extend the life of each car in the fleet by a lot.
And if it’s doesn’t live up to the claims, they pay ‘nothing’ and reap any benefits they managed to get out of it. And SURELY it would give at least SOME benefit, right?!
It’s absolutely stupid and foolish, but it’s not one single thing that makes it stupid or foolish, it’s a cascade of assumptions and estimations that makes something stupid sound plausible. There’s a world where the person “logic-ed” their way into buying this scheme—and either way it was a scheme—that was sold to them as no-lose.
They just had to forget all the other associated costs. The real world is probably either that they were completely incompetent and bought “battery rejuvenation technology” or that they tried to payout to a buddy and were had.
I use liquid body wash and shampoo. I pour on a hand, lather with both, then clean where needs to be cleaned. I can feel what’s dirty and I’m washing my hands immediately.