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www subdomains (or lack thereof)

Why do some major sites not have working www subdomains? For example, a domain registrar I have used in the past, ziggle.com, is not accessible from www.ziggle.com. This seems like a mistake to me, but maybe they have their reasons. I came across another example of this a few days ago but can’t remember which site it was. If the DNS is set up right and the .htaccess file contains the following (if using Apache), there should be no problem;

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.theirsite\.com[NC]
RewriteRule ^(.*)$ http://www.theirsite.com/$1 [R=301,L]