Here's a great video that illustrates the sometimes absurd nature of client requests and getting paid. Most clients or potential clients are not like this, but there are more than a few looking to get something for nothing. Without fail, these types of clients are the most difficult to work with, requesting endless revisions, deciding to change the concept after sketches have been approved and grabbing reproduction rights that were never negotiated, among other transgressions.
Tip of the hat to Heidi Schmidt and David Airey