Because in every workplace I've worked in there has always been one. It's never been me, BTW.
Current workplace favoured employee gets given opportunities to earn extra commission that the rest of us do not get, has been given the best, largest desk in the best location with a brand new comfy chair, and is always praised highly by management and supervisors even though she is no better at her job than the rest of us.
She is nice enough but it is making me, and others, resentful towards her, as we feel that treatment of us all is not fair.
Do all workplaces have someone like this?