There are a lot of myths and misconceptions about the teaching profession mate.
Its mainly over working conditions (55 hour week, compared to national average of 40). The myth is they work 9-3, and have tons of holidays. I have family and friends who work in teaching, none of them work that myth.
Also, as mentioned, when weighing up to train to be a teacher (not cheap, and many years of stress and time) you factor in the benefit. One benefit was guaranteed pay rises based on your experience as a teacher. The longer you remain in the profession, the more you're paid. That's a rug thats been recently pulled from under their feet as now it's performance based. Sounds fair when in the news article titles, but when your in the detail it's a bad con and performance is massively dependent on the school and area your in.
Figures wont be exact but the premise was, go to uni. 3 years. Achieve a 2:1, saddled with tons of debt. Get more debt and invest another 2 years to train to be a teacher. So thats 5 years of debt, stress, and lack of earning potential while studying. After that, you have a few years to secure a FT job as a teacher in a very difficult market - otherwise you need to retrain and go through the process again. Do all that, get a job and you're on 21k a year in year 1 as a teacher. 21k is buttons, but, stay there for 6 years and your on 31k. Still modest - including training, you're looking at 10+ years service for 31k a year? - That's now not even certain...
Then add in pensions - another area they've been conned, now paying more and getting less.
Add in the piss poor education direction - school academies and the like and the education system is on its knees. People should be pointing at Gove, not the teachers.