Eater's valuable surface was only for the planet's strongest, where Celestials ruled and Supremes were the only ones who inhabited the surface apart from these planetary sovereigns. Anything below the 12th stage wouldn't last long on the surface and shouldn't, under any circumstances, make its way there.
But even the Supremes didn't have it easy on the surface and reaching it was no trivial matter. A dense layer of dust and gas separated the surface of Eater from the areas where the planet's massive floating artificial cities were located. Flying across it bordered on the impossible, even for high-level Supremes, while the methods to reach the surface were neither easy nor cheap.