Understandable, same thign occurs with everyone's typeset, though i would ad that we have her eprobably the greatest collection of editors ever, with several thousand users if someone sees an error they could note it, if it was sufficiently desired.
[EDIT]On a similar note, perhaps it would be a goood idea to compile a list of people who are willing to copy-edit other peoples typesets, since i know just how easy it is to look at an error dozens of times and not notice it because you think your work is right

My name would certainly be on that list.
As far as the hiring of parts/printing though, i see where people are coming from on various threads, but i would say there are many pieces, Nielsen's 5th for example that I have learnt the solos from the parts here, and i see typesets as a perfect way of doing just tthat, casual and amateur musicians looking at the parts and having a blow/saw through for fun, amusement and perhaps at an amateur concert level?
My two yen anyway