>The problem with selling bits of the Sun, even that way, is...how do define "surface"? It's gas all the way through
It's plasma, so it cannot be said to have a 'surface', since electron repulsion is responsible for the solidity of ordinary matter. Furthermore, since the Heliosphere extends beyond the orbit of ex-planet Pluto, ownership of the Sun includes ownership of the Earth and all its contents, including Tarzan-calls.