I don't see anything wrong with wanting a more energy efficient DVR. Like someone else mentioned, people complain when Dish has a $5 increase and then act like someone else is silly for wanting to save $5 on their energy bill. Whether it's concern for the environment, or purely to save money people are trying to make their homes as energy efficient as possible and get cars with better MPG.
I use a computer with Windows Media Center as my DVR. WMC is integrated enough into Windows 7 that it automatically wakes itself from sleep mode to catch my timers. This required nothing from me except for scheduling recordings just like I used to on my old hopper system. I set the sleep timer to 10 minutes of inactivity and the computer goes back to sleep shortly after a recording finishes. It's been running flawlessly like this for months with no reboots or intervention necessary. This computer is used exclusively as a DVR so it is often only active for 30 minutes to an hour a day to catch recordings.
DVRs all seem to use the same amount of power whether they are active or in standby mode. It would be nice if a Dish and other DVR companies could spin down the HDD and enter a low power mode when you put them in standby. If Microsoft can figure out how to automatically wake up the computer to catch scheduled recordings why can't DVR manufacturers.
Yes, this would probably only save a couple dollars a month but all our other electronics/appliances are pushing higher energy efficiency and it adds up. It's not always the most important factor but energy efficiency is something I consider with almost everything I buy these days.