I think it boils down to what you would be willing to put your name on. Getting paid is always nice, but signing your work (logo or link) is another story. Look up the name Alan Smithee on Google sometime. It's kind of a Hollywood in-joke, but directors that get their films hacked to bits and "re-worked" by know-nothing movie execs have their names taken off the credits. So if you ever see a film directed by Alan Smithee, you'll know what happened.