The real problem for me has been that I want something to straighten out my living spaces, not to vacuum the floors. Vacuuming is quick and a good vacuum cleaner (old school bagged kind, not a silly filter one), will do a far better job than a little battery powered gizmo anyways. But a robot capable of picking up the toys my kids like to leave out, or bringing abandoned coffee mugs to the sink (can you tell I live with multiple adults and children?) would be worth quite a bit to me. A robot capable of washing my dishes and putting away my laundry would be worth more. One capable of preparing meals would be worth more to me than a car.
Of course they would have to be 100% open source with easily replaceable and repairable components, which is where I think most of these types of projects go wrong. I remember seeing the Chefee demo and it was very cool but the main problem is that you aren’t buying a product, you are investing in the idea that the company behind it won’t go belly up in two years and brick your $60,000 chef/cabinet/fridge thing and that it won’t sell itself to e.g. Google which will cram it full of ads and spyware.