Automatic litter box is a great example. We've had one for ~7 years and it's still going strong. High initial cost that pays back every day over the course of what will likely be a decade+ of usage. Absolutely worth every penny if you look to the horizon. I imagine the robot mowers and robot house maids will fall under the same type of payback but with even higher upfront costs - perhaps this will turn into yet another subscription scheme.

It is all about the ROI. A lawn cut from a professional can cost anywhere from $25-$100 on an average (per cut). So with a $1000 lawn mower, you will get the return back in 10-40 cuts at most. That is less than 1-2 seasons. Sure, there will be some maintenance cost over the years but if you look at a 5-10 year period, it is totally worth doing your own. Even with the $1000 price tag. Of course, you cannot count the labor time.

For all of these things, then what's the point of having a humanoid robot then? The last thing is a folding laundry bot that I would happily also pay $1000 for.

I have personally never met someone with a personal robotic lawnmower, and I suspect that if you have you live in a bubble that is severely biasing your view of the average American.