Also, employees? These are services that are actively maintained and developed."Alternative 1 – Colocation in a Data Center" doesn't include the 100k/yr you'll have to pay an engineer to manage that hardware.
Most enterprises, you're right. I left people off because you can handle a dozen or more DCs with only a couple engineers if you assume (design for) frequent component failure and only do a site visit/decomm/install once or twice a year.
