None of the special effects artists, sound engineers, editors, costume designers or other associated professionals are getting royalties at all. They get paid for the work they do once and that's it. Actors get royalties, but if you're not one of the top names in the film, the checks will maybe buy a dinner out occasionally.
Not quite? The reason they have money to pay the salaries of special effects artists, sound engineers, editors, costume designers or other associated professionals is because of previous movie income.