Another point: I could use Lightwave (a fairly serious 3D app that I know fairly well) but I use Poser because of the vast range of cheap stuff : fully rigged characters, clothes, props, scenery, etc.
For the level of stuff I'm doing (animated ecards), that outweighs the fact that it's a buggy, cobbled together idiosyncratic pile of crap that's extremely irritating to learn to use compared to the more "elegant" and powerful serious 3Dapps.  In spite of it's infuriating shortcomings, Poser still actually saves time because of it's merits.