I'm curious as well. It's been like that for years from memory. What possible value could this site have for the owners? Apart from maybe trolling purposes? And just who are "Steam Tunnel Operations" anyway?
They do have an MX record present, so it's possible that they still use email for some legitimate purpose.
Bear in mind they've had the domain since 1994 apparently (according to a WHOIS lookup), that length of time makes it unlikely that it's purpose is illegitimate.
