Here's a great rant from a documentary. It's about the frustration of being asked to work for free. This happens in the world of music quite a bit. For example, we've been asked to play for dirt cheap or for free, because "that other band did". Usually, it's some beginner band who love to play for nothing, just for the experience and the "publicity". Me, I'm too old for that crap. Pay me if you want me, or *&$%# (translate as you prefer).
Warning: foul language