I never said they would be affordable even in qty 100k. I would think the major use for them beyond space probes would be providing last resort backup power/he

I never said they would be affordable even in qty 100k. I would think the major use for them beyond space probes would be providing last resort backup power/heat for life support on outside earth orbit space habitats/crewed vehicles as the cost will still be at least $500/watt.