[CppCoder]

You have to put this into perspective. I am working on an MMO gane and not only can good code half the server amount but just as well the internet traffic, which in turn reduces mobil traffic consumption on the mobile device. Just like the optimized client (game) saves power on the mobile device. And if you scale this to thousands of servers and millions of players, I am sure it time invested is well worth it.

[RugnirViking]

Yes, but if it's worthwhile, people will already do it for other reasons, like the ones you listed (decreased cooling costs, decreased server costs, decreased bandwidth costs)