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The only thing that keeps poser alive is it's rich media content.  I have never seen so many beautiful 3d assets available for such a low price.  This is hands down the ONLY reason why poser is popular.  

actually, i don't think that's true.  it does need the rich media content, but that's because its users are generally hobbyists and people who don't have any art training, software or computer training, or training in 3d.  most users can't make any content.

Poser keeps going because it's easy, cheap, and has a lot of power for its price and ease.  i've yet to see another 3d app (except D|S) in which the scale and translation controls were as immediately obvious and accessible.  not saying it doesn't have bugs and usability problems, but compared to just about anything that's not D|S, learning Poser is a cakewalk. 

most Poser users wouldn't take the necessary time to make a V4 portrait in most other apps, even if she were rigged.

Quote - I'd like to add that poser's animation is very powerful but has a serious lack of documentation. I finally figured out how to animate but it shouldn't of taken this long. 

i dunno.  i figured out technically how to animate within minutes of using the program.  not, you know, how to do anything at all good, but it was easy to do something.  and a quick search taught me how to do use the walk designer, how to use it with a path, how to use the animation palette, and even how to use a few scripts to help adjust timing and stuff.  i mean, what i was doing still looked like butt because i have less than zero talent for animating, but learning to just do stuff was about a day's efforts.  but then i very rarely depend on an application's documentation.  i pretty much always take it to the Web.  well, and maybe you're talking about advanced features i'm completely unaware of.