Earlier quoted context omitted.
Instead of having one job pay $200,000 per year (let's say total compensation is $350,000) and require 18-24 hours a day of work, you create 2 jobs that each pay $100,000 (total compensation $175,000 each) and only require 9-12 hours per shift. OR You could create 3 shifts at $66,667 (total compensation $117,000 each) and have true around-the-clock coverage!
So people always bring up outsourcing part of the job to some developing country but that would run into the same problem as your third option. Having too many cooks in the kitchen will introduce a lot of operational error while having a few people who know everything about a project will run things smoother even if they are worked to the bone.
Many large companies are able to maintain a large number of server operators and perform essential functions without needing one person to do everything. With sufficient communication you can avoid the "too many cooks" problem. I've personally lead highly-communicating teams which avoid this problem. In short what you do is put one of the 3 in charge of different work as it comes up, load balance and collaborate.
But maybe it's cheaper and easier to pay one person a huge amount of money, and beat them up, than to create a highly-communicating organization of people (including email, IM, ticket system, face-to-face time, regular meetings, bridge calls, etc). It certainly looks simpler.