The dues were an issue, but the real problem was the seniority system.
My wife is excellent at her job - she takes SpED kids in pre-K, and teaches them coping strategies, so that by 2nd grade they can be in a regular classroom, and keep up.
Frankly, it is a job I could NEVER do.
And every year, they would bump her out of it, because Ms. DiedLastYear had seniority, but no experience in it.
Idiot system.