I think the attraction is simply that its new and different and is well supported. V4 is a far more practical bet and anyone starting the hobby would start there. Many people however have been collecting for years and so V4 offers little novelty. Its been out for the last 5 years and do you want to play with it for the next 5 years? People buy Miki 2, Miki3, Anastasia, Antonia, and Michelle for similar reasons. The clothing support for these models is minimal (not too bad for Miki2) and I've had mixed to poor results from cross-dresser but still for a few renders it serves as something new. So the answer to your question is 'novelty'.