Of course, you always have the option of turning off the servers and running them on a separate host. This is often advisable for high volume web sites where the web server would create too much of a load on the firewall. Furthermore, any firewall that did any sort of network address translation or proxying was brain-dead. When the server saw a packet from a host whose IP address did not match that in the ticket, alarm bells would sound and the fraud squad would be on the door step within minutes. You're right - it's not an unbiased opinion.
Lets keep the discusion on technical pros and cons please.
Compressed back issues are available for anonymous FTP from FTP.GreatCircle.