They're not there for very long that the cost of hiring the outside source isn't worth it to them. They also don't get their hands dirty because it's the outside firm making the decisions.

Before this movie was out my cousin's work did the same thing, he said that people were coming in for 2 days to lay people off and was worried he'd be one of them. He explained that the people came in and let them know and they'd give them a package in the movie they said packet. And they'd have to clean their desk out that same day. They wouldn't be allowed back. This movie explained exactly how it exactly worked.