>>212988121 (OP)Hollywood likes "star power".
It supposedly helps the films do better because mouth breathers will line up for a face they recognize.
Large successful roles will beget more large roles in hope of success.
A famous actor is a marketing tool as well as a performer.
Supposedly the "industry" outright manufactures stars by taking an actor and choosing them as the face to push. This would be a less than organic "star power" but it might still generate the needed familiarity to get mouth breathers to line up for the film.