Well, what does it cost for a crane, and how often will it be damaged by unqualified operators?
There are so many posting here as if the market place for workers is the same as 50 years ago. Then, with no education, you could work at a job that was mostly physical labor with little intellectual challenge. Today, even the entry level jobs in the steel mill I work at demands some computer skills. And that is just to start. The learning curve is steep for the first year. These are the people that are on lowest earnings tier. The demands for operators are far higher. As is the pay.
A skilled worker is easily worth 85K and more. The fact that the 'more' is going unjustly to the top is why the deep resentment of the very wealthy in this nation at present. And the wealthy fully understand this and are doing all they can to prevent unions, which give the workers the bargaining power.