Price is also a major factor. Restaurants won't balk at paying thousands for an industrial grade dishwasher if it can replace or greatly reduce the demand for a human dishwasher. Even at low restaurant wages, it doesn't take long for a $6000 dishwasher to pay for itself. On the other hand, if the only dishwashers available cost that much, if there were no dishwashers at a consumer price point? Most people would just go without one in their home.