I can only think that you haven't much experience of modern Linux distros. They are very easy to set up and configure.
I have actually, and they're all still pretty poor. There's a reason why the joke of 'this is the year of the Linux desktop' persists every year.
Where does somebody who wants to setup a small workgroup server buy a Linux server anyway? I've never seen them in the shops.
If you require RAID arrays, multiple network cards, redundant power supplies etc. then this little server really isn't close to what you want.
The desktop version of Snow Leopard can be configured to do nearly everything you want from the server version. However it requires a fair amount of knowledge to do it on the cheap. That knowledge doesn't come cheap for most professionals. They'd rather be out earning money doing what they do best than fiddling with config files in /etc