Hi BigMac,
I'm a Mac Amateur, I grew up in the Windows world. Never touched a Mac until I purchased a new iMac a few years back. The hardware and software on the Mac made using the Mac a pleasant experience, everything always work, no Blue Screens anymore. To make the move to Mac complete, I used VMWare Fusion for the two Windows Apps I "needed." Within a month or so, I found I really didn't need them. VMWare Fusion probable hasn't been used in over a year.
Anyway, I purchased a mac mini with OS X Server as an impulse buy last year.
It is setup as an OD Master, with DNS, and running DHCP.
It is setup with with more feature enabled than I had planned for. Having the
Mail Service is a great plus, I maintain my own mail server, Wiki server,
Web Server. iCal Server and Address Book Server are up and running.
I should have prefaced this by noting that I do have a static IP address from
my ISP, not sure most of the services I have configured on the OS X Server would like to run without it. The server is also setup with some file shares that are accessed by two iMacs and a Windows 7 box.
Did I need to buy it? No. But after a year of trouble free operation, don't
think I'd want to give it up now.