How many great actors are languishing in other careers because they could never make a living at acting? How many great musicians never play any more because they're taking care of too many kids? How many artists only ever paint in matte and gloss with rollers these days because it pays the bills? How can we get them to contribute to our culture again?
Mokalus of Borg
PS - Copyright used to be the answer.
PPS - But if there's no money coming in, copyright doesn't do much for you.