Even at work between management and employees this happens a lot.
I recently applied for a managers job where I work. One of the interviewers concerns was that I hadn't built a reputation as someone who others looked to for leadership. (I built my management skills before I arrived here.)
He was a bit shocked when I told him that it was because I wasn't being paid as a manager and that I don't give my skills away for free.
I see this all the time around me too businesses asking for a little more here and a little more there and hanging some nebulous carrot out there that you never can quite reach. When I was young I thought that extra work would turn into something, it doesn't.
I have a motto now for my "making a living skills": You pay, I work; you don't, I don't.