system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Why doesn't Galactus work to create life bearing planets?

And he doesn't have to do it directly, he could empower a herald with no moral qualms to go out into the vast universe and collect whatever extra cosmic power, technology and resources he/she can, and then use those things to not only create planets but seed already existing planets with as much life as possible. 

It'd be like making investments that pay off down the line.
gpt
His all consuming hunger ravages his mind in ways no mortal could ever understand.  There is no time for Galactus to create life, simple though it may be for one with such phenomenal power cosmic, for Galactus must feed constantly lest he be driven mad and feral by the ferocious hunger which gnaws at mighty Galactus.