Good advice for not only writers but everybody who, well, who works, actually:

by Andrew Griffiths
We all have to deal with people wanting us to do things for free. There are those who blatantly ask for it, those who try to negotiate on price because that’s what they do and those who are just plain cheap.
What does it mean when someone wants us to do things for free or cheap? It means they don’t value what it is that we do. And in some ways, that is kind of insulting. Over the years the projects that have caused me the biggest grief have always been the free ones or the cheap ones.