It is breaking news if there is a $40K robot that had a 12:1 efficiency ratio.*
Because production is so nascent and small, cost doesn't mean too much, no ones scaled yet.
At only $40K capital investment, even a guaranteed 12:1 efficiency ratio would be an absolute no-brainer financially for many, many, wealthy people and certainly businesses. I do 1-2 hours of chores a day if I'm lucky. If I had the equivalent of a robot vacuum working 24/7 it'd do a much better job than me.
* The whole thing is written up and shown in a way that makes you think we're on the second refining release of a breakthrough**. I don't think they've gotten to the breakthrough yet - we would have seen > 0 videos from outside the company by v3.
** Really, the whole thing has an audience of one: Musk. (c.f. focus on fingers which was recently reported as the major pain point for whatever he calls their robot not making it to production; aping of Musk-y things like the factory itself a product)