What G-SXTY says could happen in any industry but it doesn't. One word:
REGULATION
It defies belief how aviation training and employment is not regulated. I've said it before, there must be more train driver wannabes than there are driver jobs too, but you don't see type ratings or line training joy rides for wannabe train drivers.
Oh no we couldn't have that, safety is just too important! 
One could argue the railway industry is an employers market too but you don't see the same level of abuse. The reason for this abismal level of abuse in the aviation industry is because the CAA/JAA are spineless and unable to protect the very industry they are supposed to be serving.