BB-
"I just added 10 V4's to the 10 M4's, fully loaded with Morphs ++, as well as wearing 10 pairs of shorts, also with Morphs ++ in them. So 30 figures total. Oh, and they had gigantic 4K by 4K textures on them. Looking at Task Manager, I had 20 MB of memory left out of the 2 GB. Poser then crashed when I tried to render."
 
Wow thats alot.
However, I am no expert at this so correct me if I am wrong...
You essentially are using only 2 geometry for M4 an 2 for V4s only and 2 sets of textures  for all figures so. So I would assume that unless Poser  would only set aside memory for  data  that
was common to all figures. If you used different textures and different characters  then that number of characters that could loaded  would be significantly lower.

I am not trying to be  contrite; but I am interested  in finding out if this is true