Also bear in mind that it involves technology which hasn’t been sufficiently developed yet, technology which would make ground-based solar power cheaper (robotic assembly, beamed power), and that even with the relevant technology the ground station (whose costs are necessarily not impacted by lower launch costs) is more expensive on its own then an equivalent ground PV system including the cost of a battery for nighttime power.
Meanwhile, the comparable cost from solar is the total required for dispatchable power 24/7, not just the cost of PV alone.