this is only on the reported examples. Many leave the profession or signed off due to mental health issues. The industry does not support staff. If you are good then they make you do more of it, as you become a commodity they cannot afford to lose or replace within the 5 year life span. Have more lessons, do more marking, have some more CPD just incase the call from ofsted comes.
Its fear from top down, small wonder no one wants to do the job and its not about the holidays or the money.
I believe there is a fixed ceiling based the outcomes on certain areas of the report so no matter how good you are in some areas its not reflected in the final judgement.