In general it's really the opposite. In 2004 you needed a rack full of $3000 servers to run your medium business. Now it's two physical machines using 5% of the power to virtualize everything that used to run on two dozen.

Over a given period of time, computers get faster/cheaper by more than most businesses expand. When you need to expand, buying a newer, faster machine may cause you to save money because the faster machine uses less power than the existing one.