If you say so. How is the layout of land/water not the same?
The basic geometry of a plane and the surface of a sphere does not allow them to be the same.
Geostationary means not moving. Not moving means not orbiting.
A geostationary orbit (perhaps I should have said geosynchronous orbit, but they are used interchangeable) means orbiting at the same rate that the earth is spinning such that it remains above the same spot but is certainly still orbiting the earth.
Therefore, balloon sat makes sense to me. But quite possibly, they figured out a way to keep non-balloon satellites magnetically stationary, because they are all above the equator. So more likely than not, they are magnetically stuck at the only spot in the magnetic field where it's possible to do so. Because last time I checked, they don't make satellites out of wood or plastic, do they?
They are largely made of Kevlar and aluminum and smaller amounts of other metals (copper wiring, titanium frames etc), silicon for he solar cells, etc.. If you want to make the case that a mostly nonferrous object weighing a few thousand pounds can be levitated 22,000 miles above the equator via earth's magnetic field, go ahead.