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If Poser sales are down it's probably a marketing problem; the program is used my many graphics professionals and I see Poser images everywhere from advertisements to book covers to magazine articles.  Poser is many graphic designer's "dirty little secret" for while 3D purists have always ridiculed it as being an amatuer program.

I see these images everywhere too.  Rarely do they look like anything more than Poser4 was used.  That group of users doesn't want realism or animation, all they ever needed was some simple mannequin figures and a few stock poses.  That particular market would probably prefer an upgrade with less features rather than more I'm guessing...