The thing to remember here is that these systems, to the point they are today, were built by teams of people over lengthy periods of time. There are many pieces that have to be looked at from the wiring infrastructure, location, network equipment, monitoring solution, server solution, backup solution, security, OS, etc... While an individual may be capable of putting together an comparable infrastructure with only one or a few servers, once you cross a threshold with requirements and capabilities it would be almost unbelievable to find a single person who could complete the project to the same scale.