Since 1921 domestic service was becoming a steadily declining occupation in the United States and, to a large extent, in most western European countries as well. Although domestic servants were not covered by minimum wage legislation, increases in the legal minimum wage and the coverage of most domestic workers by social security and workers' compensation programs raised the cost of domestic service considerably. The number of people in paid domestic work has increased dramatically the last 15 to 20 years in most European countries. Running an average household to an acceptable professional standard requires a fair amount of work, attention and organizational skills. The place has to be kept clean and well maintained.
Shopping has to be done, meals have to be prepared and served.
The kids have to go to school on time. There's washing and ironing to be done. Friends and family might visit, parties will be organized. Now think about a household of, let's say, ten times this size. With a garden maybe a hundred times the size of your back-garden.