I recently listened to a great podcast on the benefits and necessity of maintenance. This was done by the authors of the book Freakonomics, I enjoy their work.
We often forgo maintenance of older equipment in lieu of new equipment. I am a believer in maintenance and repairs of equipment and infrastructure rather than always replacing. However, I am not excellent at articulating the why. This quick podcast, or you can read the text version, gives great explanations, good for a quick read.