The Dell Xeon workstation that I'm typing on right now is using about 36 watts total...and it's not a crippled cylinder.
Power management is an important feature for most systems - Apple isn't the only one minimizing power consumption.
Well, the "crippled cylinder" is a very unfair word. It is already being said that there are various different factors for each one potential buyer of a workstation computer. Power consumption, internal upgradability, Operating system, size factor are just some of the criteria that weight differently for each one.
For someone who doesn't want to leave the OS X ecosystem nMP is the only realistic option for a workstation.
As I said, Apple may have a false logic behind nMP, or may not. Just keep an open mind and we'll see how it goes.