T-slot Aluminum Extrusions Vs Pipes and Joints

Aluminum Extrusion - 2080 and 20100 T Slot extruded aluminum tslot My question is - why use expensive extruded aluminum T-slot? I mean, for a CNC router it makes sense because you need sub-millimeter extruded aluminum channel tslot Aluminum 6063 T-slot Extrusions offer several advantages over other materials such as steel or wood They are lightweight, durable,

extruded aluminum tslot accessories 2040 T Slot · 2040, T-slot, Aluminum Extrusion, Black · 2040, T-slot, Aluminum Extrusion, Silver · 8mm Pipe Bracket - 10 Pack · T-slot Straight Link Connector