My best attempt at a unemotional response.

http://en.wikipedia.org/wiki/Subdivision_surface.
You could look for subdividing mesh on you tube also.

Poser & D/S Pro supports Displacement maps but I've only seen a few venders use them.
No regular mesh can touch a displacement map.

Visit zBrush gallery and your see for your self ,what I am talking about.
Don't know how high the displacement map could go in Poser or D/S Pro.
If Poser or D/S Pro both could only go 1 million then they would be = for detail.

A lot of Artist that could be venders are not for deferent reasons.
Me personally I would not mess with any mesh that did not have SubD's.
V3 ,V4 are not considered standard meshes.
They have a polycount 4 times higher then a standard mesh.
Made them 4 times harder to deal with.

Since V5 ,Genesis is a standard mesh makes it 4 times easier to deal with.

If your a vender what mesh are you going to work with.
The old V4 that's a nightmare.
or
The new V5 that's a dream ?

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance