I know animated films have used stars in the past, but it tended to be because the voice was right. You're always gonna have exceptions to the rule.
e.g. Disney's superb 1973 'Robin Hood'. Peter Ustinov is amazing as Prince John but that was an exception. They picked Peter for the voice not so they could stick his name on a poster.
yet Disney's 1991 'Beauty and the Beast' had almost no stars and it blew up at the box office.