I also care that the public are getting their 12 dollars worth when they go to a movie, and that they're not coming out not wanting to ever see a movie with me in it again.
No collection of people who are all waiting for the same thing are capable of holding a natural conversation. Even if the thing they are waiting for is only a taxi.
I would define the poetic effect as the capacity that a text displays for continuing to generate different readings, without ever being completely consumed.