Good general rule is if they are making money then you should be making money. Even if they are making money indirectly you should be paid. Just because you are just starting, or modeling for a local company, or it’s “good exposure” (the lie that everyone tells to get you to work for free) does not mean you should not get paid. When you work for free you are telling the market that your worth as a model is $0.
Almost 55% of models begin their careers before age 16 and many work without any supervision and limited legal rights. That’s why supermodels Sara Ziff and Coco Rocha are working to ensure that the exploitation they experienced as young models ends. As seen on Katie Couric’s show here on segment 1:http://ktie.tv/1j9dfHI and segment 2:http://ktie.tv/1cn1RpM