Because no high-end app can do what Poser does? I mean, if you want to spend all your time trying to model every figure you render, and have them come out looking a lot worse than any Poser figure (for most of us), then model the clothes, then model all the props, just about any program will do.

People like Poser because all the tedious stuff is pretty much done, and the user can spend his time being creative. Geez, just the thought of modeling a foot would make me give up.