I'm guessing "dial-spin" morphs are so popular because you don't have to custom-fit each piece of clothing to the character. (I realize that dynamic cloth lovers are rolling their eyes about now!)

I love unique characters, Anastasia being the latest. Before that, GND4 and the various iterations of Alice. I liked them so much that I was willing to jump through hoops to get V4 clothes to fit them (haven't done it for Ana yet, because Alyson2's bones are different than V4's and conversion is more involved). 

But I suspect many vendors want to appeal to the broadest market possible, thus usually create their characters' body shapes with the V4 Morph++ dials. The faces are usually custom injections, but that doesn't affect clothing at all.