Teachers unions have put in so many job protection regulations they themselves created the need for more administrators to carry out the darn regulations.
Because if a single sentence of a regulation is not carried out perfectly, the teacher union's job steward is on the district with a lawsuit faster than a dog on red meat.
Next time you are in the County Courthouse, go take a look at the Education Code in the law library - rows of books all dense with teacher union protection legislation. Shocking, really.
When you calculate it out, per hour teachers and administrators make pretty much the same hourly rate.
Teachers only have to work 180 days while administrators work 12 months a year. Teachers either get to have all that extra time off or find other jobs and make even more money.