By understanding how your business operates, and your objectives, I can squeeze as much value as possible out of the existing infrastructure, and guide you on truly necessary upgrades.
When I first stated in computing, it was still common to actually repair machines, now they are just thrown away, which makes some sense as the components are now too small to work on, however this has extended to any system that gives any sort of trouble. When more speed or storage is required, or even new applications, then industry standard is to replace wholesale.
But instead of automatically replacing, think how much computing power you already have, and how it can be better used. In my experience most networks, will have a few critical servers that are very heavily used, while many other barely tick over. Just by changing how information flows within your network can have a dramatic effect; gaining increases in speed and efficiency at minimal cost.