The problem putting them in space solves is the approx 5X more solar energy without needing batteries for day and night cycles, along with some smaller wins due to less structural support needed due to microgravity.
There are a lot of problems that can be solved by creating 20 other, much bigger, problems.
It remains to be seen how efficiently those engineering problems can be solved, but none of the commentators here have any real insight about that (myself included). My money is on the ingenuity of the engineers that are working these problems.
So the money we are saving is commodity solar, commodity steel and community battery (or any other form of power).
And instead of those things we add, insane engineering complexity, insane complex heating, insanely complex maintenance or standing backup, insanely expensive transportation and insanely complex operations and insanely complex communications?