This is so wrong. Teachers do not have multiple prep periods, there are regular performance evaluations, and there are repercussions for not grading work or submitting plans on time. Also, most prep periods are not actually free time to get work done. They are often filled with meetings or helping students.
Teachers make hundreds of quick, impactful decisions every day and spend many hours after school and on the weekends to prepare for their work hours. And another note: I'd say that a majority of teachers work during the summer if not also working during the school year to make ends meet.
I am finishing my third year of teaching and make a base pay of $33k. With being the head XC/track coach and athletic director, teaching summer school, and working a retail job the rest of the summer, I make about $48k-$49k a year.