"Yes. Headless Macs are important for those who need high end displays. Depending on your needs, Apple really never was in that market."
They were, but it's been a while. Quadra 840AV (1993) , PowerMac 9600 (1997).
At the time, if you wanted multiple screens, the Apple Macintosh platform provided flexibility that you couldn't get on the Windows NT side. Competitors were Silicon Graphics, Sun, and NeXT, but their workstations were way more expensive.
It's obvious that Apple has moved more towards consumers, and financially, it has worked for them. But I too would like Apple to give some love to professional desktop users.
http://en.wikipedia.org/wiki/Macintosh_Quadra_840AV
http://en.wikipedia.org/wiki/Power_Macintosh_9500