Poser usues a render smoothing option to smooth out angular edges on a mesh, so meshes don't have to be high poly to look good.

Also bear in mind poser users won't be loading JUST that one character.. they might load 4 or 5, and background and plant organics... they are loading an entire scene, NOT just 1 figure.

Take your 400 k poly figure, duplicate him 5 or 6 times, and then play around with that scene in  c4d or xsi...that's what you would be looking at in poser with a 200 k figure.

Smartest thing to do, is look at the poly sizes of the default content that comes with poser, or freebies made for it as well.

I know whenever anyone has created content with polycounts in the 100k+ range, customers have complained like crazy.

(Something else to consider, 25% or so of poser users are using it on a computer 3 years old or more... they aren;t using state of the art hardware, and heavy system resources will be unusable for them.)

Way too many people take way too many things way too seriously.