It takes a specific kind of person to replace employees with ones who work longer and harder. Normal and actually good employers care about stability.
I assure you, the asshole wont give raises to people who already do whatever they say. I mean why? What would be the point to give people money for no reason?
I have this picture in my head of a programmer failing to be productive because they are constantly interrupted by their boss. Then, in the middle of the night he calls to ask something stupid that could have waited till the morning.
The next morning they sit at their desk all zoned out, trying to gather the monumental will needed to start the same task for the 15th time. They gaze at the wall for 30 min and the phone rings again. Now he wants to know when it will be finished. They want to tell him to leave them the fuck alone but in stead they say 1-2 weeks knowing the task should take about a day.
They hang up the phone and casually browse the web looking for a new job. Oh? open floor plan, nope, this one is not for me either...
The boss is like, I'm going to replace this guy with someone better!, fluffs his pillow and turns over.