They are quite useful for when someone is looking at cars they particularly like and find the blank and decide to complete the movie because of that. (which is something I've done quite a few times in the past, I wouldn't ordinarily have watched the movie had I not seen those blanks).

Along these lines I was thinking recently that it might be worth having a topic for movies that are blank, as of yet unlisted or listed just from a trailer that could be completed. A sort of hitlist.