One of the main reasons for putting "compute" and "storage" in space is that it is out of reach for the general public and would allow for more stability in exceptionally intense tyranny.

It is much easier to blow things up on land than in space, and the 'negative externalities' simpler to make assumptions about.

The value of this to the people who would be in charge of this "compute" and "storage" is likely much larger than the difference in energy cost.