Generally speaking, teachers don't have the ability to leverage their talent and classroom ability into a higher wage. They can change jobs by going into administration and make more, or they can leave teaching altogether, and often make more, though certainly not always.
Teachers have, generally speaking, a low growth career plan. I would imagine TV station employees, particularly strong on-air talent can move from market to market and climb the ladder. I would imagine that working for a small local access station might pay significantly less than say David Muir makes anchoring ABC World News Tonight. While there are pay disparities from region or school district or state, I doubt they are even close to as jarring as the anchor hosting a local access show a half hour a night and David Muir hosting World News Tonight. Talent, luck, connections, and a variety of factors allows for TV news anchors, producers, etc. to move from company to company and have a large increase in pay if the company thinks it makes sense to hire at that rate.