well yea, they do.
but then its understandable, as its also a reflection of
SEO work that has gone on before (or not) and can be taken as a measure of how youve done since the last update time, its difficult to see how to forget about it.
no, trying to build
PR for its own sake isnt the aim, but if you build a good site and promote it properly, its always nice to see the
PR reflect and validate that.