Jessi and James are completely new figures for Poser 6, they were created in Shade, no relationship to older mesh geometry.

65 of the 94 ApolloMax products are pose packages.  Just think how many pose packs are available for the Vicki figures, yikes.  I seem to remember one bored night I counted 150 texture products available for V3 Morphing Fantasy Dress (made by Anton ApolloMax creator).

Vicki2 has really been around a long time, and V3 is about 3-4 years old now, it's not suprising that a female figure that has had no direct competition has that many products available.

Sara was given away for free, and the support has tried to stay grass roots free only, not really supprising that there are not products for sale for the figure.

Mechants in general have been that if it's a free figure model then there is not a reason to develop and sell items for that figure.  Sara, Poser 5 Don and Judy, James and Jessi.  Starting to change with james and jessi but slow in moving.