The cost of cleaning, staffing & maintaining mega-mansions

Many people outside of the private service industry aren't aware of the true cost of staffing, cleaning, and maintaining mega-mansions, castles, chateaus, and manors. Here are some resources for you to explore. Each of the following pages are complete with videos. 
estate staffing cost
Staffing cost for 100K sq. ft.
logistics of a grand estate
Logistics of a grand estate
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The real-life Downton Abby staff
Costs for running a French chateau
Costs for running a French chateau
protocol for private 5-star service
How many staff needed for 5-star service?
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Costs for mansion maintenance
American mansion cleaning costs
$40K/MTH for cleaning an empty mansion
Many of the old-school aristocratic families of Europe have had to either abandon their mega-mansions and estates because of the overwhelming costs of maintenance and staffing, or they have turned them into museums to help cover the costs.