But is it marketing which helps make or break a film/book?
Word of mouth? If 5 milliin people see the summary of Elysium or Divergent maybe the word's 'post-apocolyptic' might put half of them off. Resulting in a flop movie.
Or movie distributors spend around ten million dollars promoting a movie and want to ensure the publising material is pitch on. They are concerned that if the words 'post-apocolyptic' are used it will make some people think it is to dark or to heavily based on sciene fiction. Another Matrix Reloaded or Revolutions.
If it's down to word of mouth why would a movie distibutor spend millions on marketing.
If it's down to word of mouth why is opening weekend so important? How can people recommend a movie which they haven't seen?
The back-flap description on a book, and its cover image, and its title, or a movie's trailers, and its posters, and the interviews its actors give prior to release -- these are all examples of "positioning".
When you "position" something, you are telling potential audience members what sort of thing you have made. Maybe you've made a romance novel, or maybe it's a horror movie. The point is you need to tell people enough about that thing that they can decide whether it sounds like something they'd
like.
The people who decide it does sound like something they'd like will go buy a ticket/buy a copy as soon as they can.
So why is it important to get a lot of people doing that, on opening weekend or on book release day? Because if you've put out a fantastic movie, and only 1,000 people see it on the first weekend, then you've only got 1,000 people telling their friends, "You must see this movie!"
Whereas, if 10,000,000 people see your movie on the first weekend, you've got ten thousand times as many people potentially trying to convince their friends to go see the movie too. They make a better "army" to ensure your book/film continues to succeed, and it's that follow-up success that really turns your book/film into a blockbuster (and makes you all the money.) If only 1,000 people saw the movie on the first weekend, you've got a longer slog to turn your film into a smash success -- and you might not even have time to do so before the movie gets cycled out of theatres.
You seem to be asking whether the phrase "post-apocalyptic" turns people off. No, it doesn't, but it's a waste of breath as far as marketers are concerned -- the audience wants to know what makes the
story interesting, not what category it fits into.
"Post-apocalyptic" is just a category. "In the year 2154, the very-wealthy live on a man-made space station..." implies a story. Thus, the latter phrase has half a chance of getting a person interested in reading the book/seeing the film whereas "post-apocalyptic" does not.