Why aren’t the rotation motion and traverse motion powered usually?

It’s common to see the hoist motion powered on a jib crane. However, it is rare to find the traverse(trolley) and rotation motions powered. Many times the jib crane is purchased as a cost-effective tool to cover a small workstation. IN that workstation, parts are lifted by the jib crane and mounted into machines and also bolted on to larger assemblies. The finished piece is then transported to the next workstation by the overhead crane in the same building. In other words, for movements of more than five to ten feet, the overhead crane is used. Many times buyers do not feel the jib crane also needs to be motorized, that the operator can gently push the load to nearby machines and workbenches. For buyers that do want a motorized jib crane, both rotation and traverse(trolley) motions are available as powered motions at extra cost.