Whats with the Dual Brushless Motor Stuff?

Not to start a rant or anything, but I could not imagine running dual Neu's, I have more power than I need. Why would someone use two motors its heavier, less efficient etc... and one Neu has way plenty of power...other than the cool factor I don't see any gains at all...I see the traxxas fourm going crazy for dual brushless motors stuff...weird