There's a strike happening here in Ontario schools by janitors and education assistants and early childhood educators, because they want more than a 2% raise on their $40-$50k year jobs ($30k USD, and look at inflation #s...). The government is going to use a special "shouldn't be used" clause in the Canadian charter or rights and freedoms to force a contract on them and ban a strike and forbid collective bargaining despite it being a charter right. These are people who clean poop, shape young minds, and keep critical systems running, and so on.

All of this to say: difficulty and importance of a job seems to have almost nothing to do with either the pay one gets, or the respect one gets.