Going all the way back to the original post ...

I suspect that many people have a large inventory of V4 related content and still find that this particular model fills 99% of their needs.  I use Carrara myself, and have a number of characters from both SM and DAZ, but find I reach for V4 (or M4) when I need a human character.  At this point, given the sunk cost investment in V4/M4 it would take a true breakthrough (not weightmapping or scaling, nice as they may be) to move me.

Klebnor

Lotus 123 ~ S-Render ~ OS/2 WARP ~ IBM 8088 / 4.77 Mhz ~ Hercules Ultima graphics, Hitachi 10 MB HDD, 64K RAM, 12 in diagonal CRT Monitor (16 colors / 60 Hz refresh rate), 240 Watt PS, Dual 1.44 MB Floppies, 2 button mouse input device.  Beige horizontal case.  I don't display my unit.