XML databases

Just wondering.
Recent announcement of BaseX update.
What use cases are there for dropping a few hundred
XML files into a (purpose built for XML) database?
 I can see a risk (db failure) above the file system
failure risks.

Has anyone done that assessment and decided in
favour of a database over the file system?

Just curious.

regards

-- 
Dave Pawson
XSLT XSL-FO FAQ.
Docbook FAQ.