Markets in everything -- who buys this stuff?

They do:

Like many women who buy runway styles, Ms. Berkowitz wears much of what she buys to charity galas. She gets multiple wearings out of her gowns, including a red Zac Posen one-shoulder gown and a silvery Marc Jacobs dress with a dark-brown sash. She carefully keeps track of which she has worn where and rotates them from season to season.

Christine Chiu wears most items only once. The 28-year-old, who is married to the founder of Beverly Hills Plastic Surgery, goes to events every night of the week—often making multiple wardrobe changes in a single night.

"If you're going to a gala for some kind of disease and then you go to a hip art event, you can't wear the same thing," Ms. Chiu says.

I loved this article, recommended.