I was recently introduced to the world of ball jointed dolls (BJDs) in a recent LA Weekly write-up on Artmaze, a Korean-based company that produces a line of ultra realistic, ultra creepy BJDs called Elfdolls. Not surprisingly collectors include many fans of anime and cosplay. Den of Angels, one of the BJD forums hosts 9000+ active members on its forum. There is a thriving cottage industry in BJD photography, clothing, and something called faceups (the painstaking hand application of facial coloring). This isn't exactly a kids hobby, as larger dolls (55-60 cm in height) retail for $500+. BJD aficianados stage elaborate scenes with their dolls, like deaths, weddings, and yaoi encounters, granted with the latter it's a bit difficult to tell sometimes with the prevalent androgynous J-rock theme going. Personally, I'd find it a bit disconcerting to have dolls this realistic staring at me in my house, but to each its own.
Note: I was kindly corrected by the owner of The Lost Boys blog, which I had previously referenced for death scenes. The dolls appearing in his blog are Living Dead Dolls and not considered BJDs.