Early in my career, when I did technology for a very large financial firm, we started with dedicated servers for each business process. It was an easy way to track costs, manage risks and allow each business unit to maintain control.
Unfortunately, it was also an exorbitant way to maintain control. As servers became more powerful and disk cheaper, processes utilized less and less of their capacity. Even more than the costs of the infrastructure itself, the costs of the staff to deploy, maintain and support each piece of infrastructure could kill profitability.