Another example of this are the compasses at my school. The 9th grade students use compasses and I spend a lot of time fixing the compasses.
"we could just buy a new set"
A new set would cost less than the ostensible hourly rate for my time. But I'm not paid by the hour, and happily everyone agreed that throwing away broken compasses was disgusting. It would set a bad example for the children.
But every year I have to fight over this.