Buying a planet is indeed a peculiar concept. One might well assume it comes with certain "small print" clauses, much like buying a cross-country vehicle hereabouts until recently carried the obligation to hand it over to the government in certain types of crisis, for no recompense or promise of return.
Flint's case is a rather flimsy one anyway. What possible claim does he
have to the legal property of this Mr. Brack?