No subdirectory accepted in /var/run ?

[herbert langhans <w3%langhans.com.pl@localhost>]

Hi List,
some behaviour surprised me:

I create a subdirectory /var/run/snort
I restart the server - subdirectory /snort is gone

It would be good to have this, since snort's pidfile has trouble with 
it when I restart snort. Also I dont want to be to generous with the
/var/run permissions.

Any ideas? Thanks!
herb langhans