Read the manual..
You have to go up to the machine to put it into stand-by and also take out out of standby, so why not just turn it off too?
I personally have mine plugged into my stereo. I put mine into standby and then when I turn the stereo off, it goes off too. This keeps me from forgetting about it and leaving it on all night.
They need a way to wake the system out of standby with the controller. I really see no reason for the same by since you have to go up to the machine to do it anyway.