Then there are actuators. Small robots use servos which are not fast enough. Bigger robots, like those from Boston Dynamics, use brushless motors. Which are fast, but have limited torque.
Then there is the cost. Without volume it's absurdly high.
Then competitors, they can easily reproduce. For example Boston Dynamics sell it's dog sized robot for $75k, while mechanically similar Chinese are $4-10k.
Then the biggest question is what are you going to do with it for this price? Special note: we already have vacuums. You cannot send it shopping alone. Any other realistic ideas?
Basically, with current automated solutions humans form the "glue" between all existing home automation solutions, because humans are generally capable where existing solutions are specific and fragile. If that "glue" role can be performed by a humanoid robot, then it dramatically reduces the amount of housework humans have to do.
As for who might buy it for the price, the obvious answer is people who are rich enough to afford it but either not rich enough to hire service staff or who don't want to employ service staff for other reasons (privacy, don't want to be personally exposed to wealth inequality, racism, fear of theft, fear of disease). Another answer is disabled people. A lot of disabled people love their support workers and have important, humane relationships with them. A lot of other disabled people (like me) love what support workers do and think it's important but are unwilling to go through the arduous process of finding someone you trust to be there when you're at your most vulnerable, or being forced to make do with one of the small proportion of support workers who don't care about their clients that much or are borderline abusive (or actually abusive). In countries with socialised or subsidised medicine, I could very easily see the case for covering humanoid robotic helpers. Already in my country various machines worth up to $8000 or even $100,000 can be covered for disabled people depending on how much it would help, the medical need for it, etc, under various different programs. These aren't small programs either, a lot of disabled people here have access to these resources. A lot of money is also allocated on an ongoing basis specifically for support workers, and for humanoid robots specifically I could see them being eligible to access those funds because of the overlap in role between them and support workers. It won't be a good solution for every disabled person, but it could be a good solution for a lot of us.