actually, i think lots of people don't use shadows because they have to work hard to get good ones.  i'm sure i just need to upgrade, but I use P6 and i get bias errors on just about all dynamic and draping clothes.  and sure, a lot of people are on P7 and Poser Pro, but a lot aren't.

oh, and it's a lot longer than an hour if you use raytraced shadows and some of the most popular hair.