CP take products for any character, including some of the lesser known ones. But those people who do support the G2 figures (me included) put products there for preference because it makes sense to have those products in the same shop as the figures. And Apollo has his big forum there, so there are Apollo things. I would guess people who are making skins for Vicki would probably opt for the AZM for preference.

A lot of the things I make, landscape props, shaders and stuff, are store-neutral, and they go to CP just cos I like it there.

Probably Renderosity is indeed the most neutral of the big stores now for character add-ons, purely because they don't have any 'official store characters'. But Cp takes things fpr DAZ people, and now the AZM is going to take things for CP people. The way it ends up is just cos it makes marketing sense when vendors are choosing a store.