My theory: If you look at the clothes that were released for V4 and her spin-offs (S4, A4, G4), they all fit V4, but only some fit the others. If you've collected a lot of content (for instance, you're a PC member), after a while it gets tiring trying to keep track of what fits whom. It's just easier to say, unless I really need a short chick or a stylized toon, to hell with it, I'll use V4 as my default.

I know you can add the morphs using various utilities. But I'm guessing that, for a great many people who only have a couple of hours a week to spend on their hobby, that's too much trouble.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.