It's not always just about that.
Sometimes, it's cause people want to be able to use their full potential. I have worked in places where it seems like you as a person do not matter just that you have two hands and can follow instructions.
Your views.... not considered
Your suggestions.... not considered
Your pains/problems.... not considered.
We all want to make a change and write our names in history. If we are part of a team where you feel you are contributing and you are all working towards a collective goal, many people won't want to leave.
It was very well explained in the book "the 8th habit by Stephen R. Covey."
The fact is most companies in Nigeria treat employees like shit. Afterall, there are many more people that would gladly take your job.
Go to private schools for a great first hand experience.
With such prevalent experiences in our society, it is no wonder that everyone wants to be the boss. At least you are valued there.