Thanks for the feedback people.  This bugged me enough that I called SmithMicro today and spoke to a guy in tech support.  He told me the MP vendors who put out dynamic hair styles "sold as many as I can count on my one hand" and said there just wasn't a demand for it.

I beg to differ.  There hasn't been a new Poser dynamic hair model in MP for three years and in that time computers have gotten a lot faster, Poser now runs 64 bit and between P5 and P-pro the dynamic calculations can only have gotten better.  Also if there's no demand for dynamic hair then why is DAZ releasing Carrara dynamic hair models on a more regular basis?  And why do they look so much better than the ones for Poser when Poser has had such a long head start?

I must add the guy at SmithMicro tech support was very interested in my concerns about this.