True, but having a distinctive look is part of creating mind share. When you walk into a all-Apple office, you'll see very unique-looking laptops and desktops. That's part of what makes the brand valuable.
Raptor could derive some extra points from a unique enough case. Deepcool, Lian Li and Corsair (the ones I found in less than 5 minutes) sll make some that, with a change in highlight color to match Raptor's logo, would exude the aura of quiet power you want from a professional workstation and, hopefully, make people want to put it on top of the desk instead of hidden under it. ;-)
You probably can't buy one from Dell or HP like that but look at the custom PC builder stuff.