Waterjet/Laser cutters in-house?

[asid61]

What makes a waterjet a better option than some kind of CNC router? For the metals that FRC uses, wouldn't a router of equivalent price do the job just as well?
Just thinking about the lower operating costs and maintenance and the very-close speed of the cut, what makes a waterjet better than a CNC router in general? For the speed thing I'm just going off Youtube videos showing waterjets working and CNC routers working, so I'm not sure if I have a good grasp of the capabilities of a waterjet.