It's a standard thing that film actors and such will work for free to build experience, a resume, get a clip for their demo reel and exposure. That's how hundreds of student films are made every year. And they're willing to work for free because they assume that more likely than not, the films won't make any money. I'm sure the folks working over the nearly 2 years on this guy's Zombie flick weren't expecting anything to come from it. But- if it does turn out to go somewhere then of course they'll expect some money from it Not to get rich, but industry standard pay for the job they did. For example, an actor with a speaking role gets about $800.00 a day. And they should- no one has a right to make money off of someone else's talent and not compensate them for it.