ExodusNirvana
Change is inevitable...
He does'nt eat a planet as much as he simply consumes all life energy that exists on it and that takes a lot of set upWhy won’t he just eat it? Why is there a struggle?
The Fantastic Four usually stop him...and then The Ultimates did last time IIRC
Earth just has a lot going for it in terms of power
There are Omega Level Mutants (Cyclops, Storm, Iceman, Mags, Jean, Xavier, Franklin Richards, etc.) running around the planet, powerful mystic energy sources and conduits, not to mention the possibility of a Cosmic Cube or even an Infinity Stone just happening to be here.
Earth would be the equivalent of pulling an all nighter at an All You Can Eat Buffet at the finest steakhouse in NYC or LA