staff on other servers

I was applying for staff yesterday and i noticed something a bit unusual on the template copy. It said this at the top of the page:
"If you are a staff member of another server, you must step down from your staff position on the other server before applying here. If you are caught as a staff member on another server, you will be kicked from the staff team on CubeBuilders and you will be blacklisted from applying again."

why is this?

i really want to know

Nemesis

When you are staff it means you are DEDICATED to that server, and you wish to help the community in many ways. If you would be staff on TWO server, how could you be dedicated to both? All of the staff at cubebuilders live up to this expectations, and are dedicated players to our server. ;D