Sometimes I wonder why you even watch anime.
Like, if it was up to you, every shonen series would end after the first arc. "Well, the badguy is clearly too powerful. Better just give up."
They're attitude is fairly typical of "Never give up no matter what!" "I'll get stronger and defeat you." found all over the genre.
Unfortunately for them, this series is a subversion and Ainz is the protagonist. But they don't know that. So they're still never going to give up.
Like seriously, you're complaining about shit being boring, but you're also saying that it should be even MORE boring than it is because that's what would "make sense".
Bullshit. He's made it clear that he only considers monsters to be "his people". He's repeatedly stated that he doesn't care if all the humans in the village he controls die, with the exception of the handful that are needed for his potion project.