I agree with hborre like everyone else. I also have a theory that the earlier versions of Vicky were better than the figures included with Poser at the time, and the current popularity is a holdover from then. Can't be sure, though, since I wasn't involved in CG at the time; that's just a possible explanation I've thought of.

~*I've made it my mission to build Cyberworld, one polygon at a time*~

Watch it happen at my technology blog, Building Cyberworld.