I agree that people know what they're getting into. I disagree that that precludes them from being able to complain about and change their workplace. A little study into Airline flying in the 1930s and 40s should help illustrate this point.

Likewise, there are doctors fresh out of Med School making Regional wages...they also have the right to complain. There are certain industries where individuals leaving over low pay makes no dent in how things are done, and we're in one of those industries...group action is the way.