If the movie is showing in the park for free, you can stick around and stand to watch it, but if there was a better service at a reasonable cost, you could go home and watch it there more comfortably.
Works even better. You can stand in the dirty alley (with piss smell and dog poo) and watch it, or go home and watch it comfortable, if the price and service is right. Sure, some people will never go home (maybe they don't even have one), but most people will, given the right incentive.
If the movie is showing in the park for free, you can stick around and stand to watch it, but if there was a better service at a reasonable cost, you could go home and watch it there more comfortably.