The weight-per-foot of a profile is important because of the effect it has on profitable press operation. Is the profile too heavy? Is it too light? Many factors affect press operation and the press size required to extrude a profile. Your extrusion partner will provide the information you need to improve your profile design to extrude cost effectively.
Generally, the design is greatly enhanced if the profile CCD is kept under 8 inches and the wt/ft is 3 pounds or less.