You find it very enjoyable as king of the prison. You can get everything you want, and everyone is very nice to you - at first, that is. After some time, though, you notice that the eagerness to please starts to wear off, and other prisoners and guards start to get more aggressive towards you.
Soon it comes to open challenges against your power. Prisoner after prisoner tries to dethrone you. Sometimes they gang up on you, and often you only just manage to beat your way out.
The pressure of being king is too much for you, and so you have to find a way out.