There are no advantages of being a slave of a cat
Well, I'm now sat here with a purry, furry, self-heating hot water bottle curled around my shoulders. How could that not be classed as an advantage?
Other advantages are as follows:
1) Rodent control officer
2) Food quality control officer
3) Paper shredder
4) Ghostbuster (under bed / in bath plug hole)
5) Personal weather station
6) Team mate for games of carpet football / carpet rugby
7) Personal groomer
There may be other advanteges depending on what model of cat you are owned by.