Nevertheless variation helps. You don't need to go crazy about location, but it will help. However, the main thing is action and the way it's displayed (as in filmed/shot). If the action is good, you won't even notice the background.
This being said, we did some research on the location factor. It might be slightly skewed from general results since it was done on porn star niche sites, hence people was looking for pornstars, which is a very very specific niche most people seems not to understand. Some of the results shown this preference (in order)
1- outdoors (nature)
2- outdoors (urban)
3- dark ambience
4- exotic ethnic scenarios
5- office/work sets
6- kitchens
7- bedrooms
8- living room
9- cars
10- bathrooms
This preference has a logical explanation from a psychological point of view, so I assume more or less it will apply to most general niches.
Anyway, the point of the OP was more directed to content rationalization rather than the content itself, but this is a very good discussion as well.
In my country, we call the usual membership site's behavior "la máquina de hacer chorizos" (the choritzo machine), meaning that you put anything in it and mass produce without caring about the final product.
As I mentioned about the pictures, it's outrageous to see the way they're displayed, but you can see the same about videos: 45 minutes of a guy pumping a girl and he'll never come, the girl usually looking bored as hell (well, after 45 mins...), no edition at all, boring camera angles that usually never shows the real action and so on.
Talent is another important factor in the equation, but I won't get any further since I've some amazing site to finish for a client, and he'll probably kill me if he sees me posting here instead of working on his site, lol
