Re: Stupid (I'm quite sure) question...
Why just park it out a bit and leave it?
One doesn't just park a decommissioned satellite "somewhere out there" in (deep) space.
Ever heard of "billiard balls"? What happens if a comet should collide with this junk? A chain reaction would occur making space like a gunfight in a concrete room with your eyes covered -- in short, not a good idea.