Yeah, it makes no sense to use an iPhone as web server, although the hardware could be used in some interesting ways if this would be possible. You could, for example, set up the iPhone to send a phonecall or SMS with pre-recorded message to someone who, for example, send his phonenumber through it's web interface to be included in it's address book.
Again, it's not very useful, but it would be cool to be able to communicate with an iPhone-based web server. Who knows? Maybe someone does come up with a practical purpose for this!