Well, I wouldn't want to load my scene down with a ton of Michael 2's for background crowd movement when dork looks, at a distance, just fine. I have very large background crowds in my animations and so, the dork IS still very useful. Why would anyone want to use high poly background characters when you can barely make out the faces, anyway? That would be crazy. I recreated the Blob theater scene (the old version). Everything in that scene was an old, tired figure but you couldn't tell. The scene looked great.

I also attempted to recreate a scene from the "old" Rollerball movie. I didn't finish it because I got work (YAY). I will someday do so but the crowds looked fantastic. Guess what they are made of? P3 and P4 people. If you're a professional, and for some strange reason you're using Poser instead of a high end app to make your money then why would you throw away any tools. In our field, you never know what might end up being useful down the road. DP, I wouldn't put that football player up front but In the backfield or running after a high poly character... yes, with out a doubt. Or... as some have suggested... go ahead and use all high end characters and watch as your deadline gets pushed back a couple of weeks or you lose the job because you can't finish on time due to long render times.

Back them up, archive them but never throw away any of your tools... ever. One day, you might regret it.