> That means that a sphere drawn at geo altitude has a surface area around 300x as large, and the volume of a 2km space above and below these altitudes is 5000x

> That means that a sphere drawn at geo altitude has a surface area around 300x as large, and the volume of a 2km space above and below these altitudes is 5000x as large The size of a sphere at geostationary orbit altitude is essentially irrelevant, because the only reason you go to geostationary orbit is to be geostationary, i.e. in a narrow band at the equator. The other 99.9% of your sphere is completely unused.