The crane manufacturing business case is not driven by material efficiency to the same degree. It is a tool that needs to be reliable and have performance in operations. Limit the need for man hours through ease of use etc. It should also be able to take many assembly/disassembly cycles.

Thus does the amount of material not matter as much in a crane.

For wind turbine towers the material cost can be >>50% of the installed cost.

Working for a crane manufacturing company. While raw material costs are maybe not that drastic, we consider material efficiency the most important metric for cost and a lot of brain power was spent to optimise the amount of steel used. There are multiple reasons for this. The ones I can think of are:

  * The margins for cranes are thin and steel is expensive.
  * Thicker steel is harder to work with, increasing manufacturing cost.
  * Each kg of dead weight may decrease the performance of your product, e.g. max. Live load. This is especially true for the jib.
  * More weight at the top of the crane may necessitate a sturdier structure below, amplifying cost even more.
  * More weight may require more ballast blocks, which are costly (especially transport)
  * More weight means higher transport costs
  * More weight means more wind area, which is the critical factor for high constructions.