As Glenfihi says, the ease of putting together a music server system using a PC or Mac, off-the-shelf hard drives, relatively inexpensive playback software and a DAC means that purpose-built servers have a hard time competing on price and inevitably are quickly behind the technology curve.
Music Servers-Why so few?
With the explosion of Dacs and discussions of computer audio one would think the server market would flourish as well. Where are all of the "big" names and their offerings? They can certainly produce Dacs. With the exception of Bryston, it seems the small companies are the only ones who offer something and then its a crapshoot as to who will be able to answer an email or have a decent website with useful information. Where are they?