Two intresting points here ;
A qualified teacher with a degree could walk into most professions, earning 2x the 30,000 they earn.
I also agree with Neils point on they should have some real life experience before teaching.Most teachers live there school life in a top set where behavior is normally impeccable. Then when becoming a teacher they take over a bottom set and then its body shock time.
Most people only complain because they think they pay for the teachers
.