For me, the biggest issue I have seen with the Poser characters has always been the rigging. I used to try to use a few of them but it ended up that I had to take the heads off and use another body because things like the forearms were bending in the middle, etc. I barely look at the more recent ones but they have always had similar issues.

As to why I might not want to support it, they have a two year life expectancy, at most. Then they will be replaced by the latest and greatest thing that will probably have no support either.