I havent heard about this in a long time, but middle-east buhzillionaires used to arrange to have western beauty contest winners 'spend time with them'. Typically, the women got their own wing of the palace as part of an all-expense-paid stayover. I never read what the 'compensation' was for such an excursion but apparently those dudes collect expensive pussy like Jay Leno collects antique cars.
Ah, now we are talking about the real high end, not petit bourgeois "high end" where high end is not $400-$500 but $1000 or $1500 or whatever.
My knowledge of this little sub-culture comes from two sources - a New York ex-model and a tabloid documentary on the Sultan of Brunei's harem.
Someone mentioned the way the high high end is done is two wealthy men passing a girls card to one another. I disagree, I think it is the other way. The card passed is that of the man's, among a group of what would be potential women for him.
Here's a lawsuit against the Brunei guys:
http://www.thesmokinggun.com/archive/sultan1.html
"According to a lawsuit filed by ex-Miss USA Shannon Marketic, portions of which are reproduced here, that country's billionaire rulers regularly import American women for six-week stints as high-paid hookers. Marketic, a devout Christian, claims she was unaware that, in exchange for $127,200, women were expected to serve the Sultan and his rowdy friends. The 27-year-old actress/model initially sued the Los Angeles "talent agency" she says recruited her, as well as the Sultan of Brunei (identified here as Haji Hassanal Bolkiah) and his brother, Prince Jefri. But a federal judge last month ruled that the Sultan, one of the world's richest men, cannot be sued due to the immunity afforded a head of state."
...I'm sure agreeing to play ball with White House schemes like Iran/Contra helps in this regard as well.
The tabloid documentary interviewed a lot of the women who went to Brunei. More than one Miss USAs. Miss United Kingdom runner-ups. A former Penthouse Pet. If you're curious what the contract of the American agencies is with the girls take a look -
http://www.thesmokinggun.com/graphics/art/sultan12.gif
The similarities between the model girl and what I remember of the documentary and can see on the web is thus - models were paid to travel to a remote place (a Persian Gulf country, Brunei) and serve for several weeks or even up to a year in a high-end harem of mostly white western beauty queens, magazine models and the like. The girls were well paid for this. The existence of these opportunities was known on the model or beauty queen circuit. The contract prices listed here are akin to what I heard - the girls get $20k and up (up being $30k, $40k, $50k etc.) per week, which would be $1 million a year or more, and some of the girls stay longer than a year. Now THAT is high end. The one difference from the NY model is the girls supposedly were not required to have sex with anyone, although they did have to dress provocatively, go to dances and the like and dance with whomever. This girl did screw the sheikh's son, or whoever it was. Who knows what the reality of all of that is though. I've heard lots of crazy stories from Westerners working for wealthy Persian Gulf oil sheiks over the years.
In reading the news articles just now, one thing I did not recall is these sheikhs and whatnot often have floors rented out at fancy hotels in London or Beverly Hills with these girls. I'm sure the same goes for Monte Carlo and other places.