Why is it important to use demo.redhat.com domain in RHEV evaluation?

I was wondering if there is a compelling reason for important notice:

During installation, set the fully qualified domain name (FQDN) for the server as rhevm.demo.redhat.com.

at http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Virtualization/3.0/html/Evaluation_Guide/Evaluation_Guide-Multiple_Hosts.html

It would be easier to use our existing test domain instead of demo.redhat.com.

With best regards,

Cristian Seres