If you hire a house cleaner 3 days a week for 3 hours for every week of a year. That should keep your house in near pristine condition.

That's around 450 hours a year. Pay them $20, thats $9000 a year.

Probably waaaay more hours than you would need at way over the market rate, and still cheaper.

Those robots probably break often too and still are hard to fix. And are not flexible in terms of tasks (only flexible when the work)