Follow the example of the world champion in the domain, i.e. SNCF.
Like them, implement some kind of lousy "not available" message to display if you hit your web site without typing www in the URL. Since many users now omit the dub-dub-dub prefix, your site (hence your company) will always appear under repair. Or on strike. Or both.
Try it! Click http://sncf.fr now!