"Try to remember that many of those 'Lusers' will be the people who actually generate revenue for the company so it can continue to exist
I'd just like to echo the commenter above and add that if someon'e job involves adding unsecured network hardware to a corporate environment without permission, then that person is not a revenue-generating asset (no matter how high their opinion of themselves). They are a liability. Increasing risk exposure in an uncontrolled manner is never revenue-generating, and if you have people like that in your organisation, they need to be shown the door. Or the nearest window. By applying a voltage if necessary.