In response to a question you mentioned that Darkseid was the only good villain you could think of who chased after power for its own sake. But what about Doctor Doom? Whenever he sees a chance to achieve godlike power he grabs it with both armored hands. His performance in Secret Wars (the original and the 2015 event) come to mind but they’re not the only examples IIRC.

Doom wants power, he luuuuuuuuuuuuuves power, but he very much wants power for something. Whether it’s to show up THAT FOOL RICHARDS! or to demonstrate that he’s the best or the strongest or to get everyone to love and admire him for a change or to pursue any other personal agenda…

And that’s what makes Doom so interesting – there’s always a personal agenda there, some deep-seated need or drive that’s pushing the story forward, even if it’s something as simple as petty revenge. It’s what allows story beats like Doom conquering the world and then giving it up because it’s not fun without superheroes to challenge him. 

That’s a beat that you could not do if, like Darkseid, Doom wanted power for its own sake instead of power for a purpose.