This is something that I do consider to be good advice: I took my first paycheck and I put it in the goddamn bank. Then I took my second paycheck and put it in the goddamn bank. I had seen the roller coaster of my father’s career—top of the world, then unemployed, top of the world, then unemployed—and I never wanted to take a job because I needed money, and I never have. I saved my money, so when I went, for instance, to The WB with Buffy the Vampire Slayer, I said, “This is Buffy the Vampire Slayer. If you want something LIKE Buffy the Vampire Slayer, God bless, I’m outta here. If you want THIS, this is what I’m doing.” The one thing a creator can bring to the table when everybody else has all the money and power is a centeredness and the ability to walk away. Never sit at a table you can’t walk away from.

Interesting advice from Joss Whedon from ‘The Definitive EW Interview’.