Why does PUE work?

PUE is a data center metric that is used to market data center efficiency.

Why does PUE work?

Dilbert has the answer.

Seriously, PUE does have a benefit for the informed, but for the novice PUE is a number where the lower the better.  Easy to understand.

Why does PUE work?

Because PUE works for marketing data center efficiency.

But, almost no one asks how and over what time the PUE was calculated.

LEED building ratings work the same as a marketing tool.  Ahh, you gained your extra points by the waterless urinals, bike racks, and energy efficiency lighting in your office space.