One other little tactic used my on-site folks is to make everyone else look crappy (employees and contractors from other companies) except the employees who directly affect the contract. That way the client gets rid of these undesirables and brings in more of your people thus increasing your revenue.

Accenture played this game quite well, made for some very unfun working environments for friends of mine. I was lucky enough to work at places that didn't have the big contracting companies when I was doing consulting.