Peter David's posted a great column detailing the many depredations suffered by comics writers, who get no respect.
When artwork is returned from a comic book, the penciller gets two thirds of the pages, the inker the remaining third. This can be a valuable money-generator because of the value on the art market.
The writer? The one who created the story that the penciller drew and the inker inked? We get to sit at conventions and watch stories taken from our heads sold piecemeal at $50 and up a page. One artist once said, "Hey, if writers are upset about it, I'll remove the word balloons and give them back."
(Thanks, Glenn!)