Quote - I guess you could sculpt clothing directly onto these models, suitable for all your archivis needs. Somehow, though, I suspect the archivis types wouldn't waste any time fussing with clothing morphs when appropriately dressed, low-res, prefab figures can be purchased elsewhere.

Exactly!  No client cares about 'original looking' people in an arch visualization enough to want to pay you for the time and effort needed to make them.  Couple of hundred bucks at places like evermotion or archvision will buy you a pack of 100+ figures made and optimized specifically for that use. Some of them even come with animation paths. All ready for import.
There's no way one can make them in Poser Pro at 2 dollars per figure. You have to be able to make one a minute to make it worth your time.

Plus, for arch viz, where an imahe of a person id only 200-300 pixels high (smaller then in most video games) 15,000 polygons is a major overkill.

Unless you're doing animated closeup or a drive drive-by's, static panels with an image mapped onto it does the job in most cases.

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