It seems like it would be more effective to start threads where photographers say what they think would be a fair price. I know I started a thread asking some years back and got a lot of how-long-is-a-piece-of-string nonsense in reply:
What are the current going rates for photo and video content?
As far as Met-Art style content goes, a lot of that is done with natural light and reflectors. The girl needs to be cute and fit and have a certain look, but I don't get what would be over-the-top crazy expensive about that.