The irony is that they still have a server up and running - else we wouldn't be getting a working "We're shut down k thnx" page. Going through the extra effort to set up a redirect and thus prevent access to all presently available, static content, presumably actually costs more money than just leaving it as it. (Yeah, maybe they have multiple web servers and whatever and maybe they've just slapped a lighttpd or nginx on what used to point to the outside world and run an HAProxy instance [insert other comparable software as your leisure, I'm just coming up with an example], and maybe that saves them a small amount of operating costs, but I find it unlikely that the set up they have at the moment would be substantially cheaper than just leaving their site as is.)