although the job title changes and usually a promotion is involved, that is one of the major ways corporations attract new blood. Sometimes, a person in the same company will not get promoted even if they deserve it and a person from another company will be hired in making good $$$ at the "promoted" position. even though they may not be as good or qualified as the person within the company who was passed over. not exactly what you were talking about, but in fact it is very similar. many of the people passed over who deserve the raise or promotion are passed over because it is known they will stay for whatever reason. people who will stay no mattter what give employers a leg up and put themselves in a more vulnerable condition in some ways. being a contractor makes you vulnerable for more obvious reasons, but house people have their own issues to deal with, like this one. pick your poison AND pick your pleasure!