My $.02...

Vendors continue to make V4 products because they continue to sell FOR WHATEVER reason. Many of us have realized that with the advent of the advances in Poser 9, EZSkin2 and Scene fixer there is a LOT of milage left in the existant figures (V3 et al included.)

Until V4 is of no further service to a large audience, I believe you will continue to see products for her, advantages of any other figure(s) not withstanding..