Probably because the injection system is not what they are used to. It takes some time to browse through the libraries to find the good morph injection, and it takes some experience to figure which morphs you'll use, more than is needed for just toggling the dials. BTW : the main issue I have with buying V3 is that I spent quite some money on accessories and characters for V2 and I don't see the point in spending a lot more for V3 (V3+morph packs+textures/universal texture converter, new clothes, etc...) since I don't do close-up portraits nor am I a professional artist (and I have yet to see a non-portrait V3 image that could not be done with V2 and some postwork). When I see a V3 outfit that I like, I grab/buy it and convert it for V2. Back to the topic : the morph injection system is quite interesting (I have microcosm based on this), but it may be more easy to handle in Poser5 or with PBoost since they both offer an easier library management.