Comment Re:You would need (Score 1) 210
I think the point of doing it in space isn't the efficiency, it's the fact that your burning all of that fuel in space, without impacting the environment here on Earth. The idea being that the Earth and its environment is a much more valuable resource than the extra cost/fuel/time it might take to do all of the tasks of heavy industry in space. We'd essentially be inflating the cost of industry to help keep the environment clean.
Does seem a bit pie in the sky but at least someone with means is actually trying...I for one welcome our new industry in the vacuum of space overlords.