This "theory" of why the bankable sick days was created has been bandied about by the left here quite often,..."give them an incentive to come to work"
But what we are really saying is, that teachers in the past were already abusing the system,...so lets come up with a way to GENTLY coach them to be more responsible and less greedy.
FAST
Generally that's done by one's parents during infancy. By adulthood it's too late for those who picked an occupation they weren't prepared for by gentle coaching. Greed and irresponsibility are highly desirable in stock markets for example, where the actual work done or product produced is immaterial.
Of course if your work with the kids that attracted you to teaching is being defined, supervised, assessed and compensated by people aping the profit-taking sector's greed and business school management style, you'll likely be smart enough to catch on and exploit their system with the same sense of greed and gaining advantage they had in mind when they constructed it.
The teachers didn't invent paid sick days rationed out and counted, nor did they invent banking them so the responsible unselfish teachers wouldn't be penalized compared to the greedy ones who took every day off they could.
If you want a system that produces unselfishness by rewarding it [sic] and assumes and requires responsible behaviour, then you have a whole lot of bad child-rearing across our society to undo. Starting by expecting and assuming the best instead of suspecting and assuming the worst is where the books say parents should start. You know, what they call the 'collegial, collaborative' approach.
Say something good about teachers and their association; show us how it's done.