"on average those that work super hard whether as cleaners or doctors tend to earn more on average"
Sorry - doctors generally earn 2, 3 or sometimes 4 times average wage, whether they work a lot or they work a little. An experienced GP can work one day a week and bring in the equivalent of a full-time average wage.
People on minimum wage can only make a living by working ridiculous hours that damage their health and the happiness and wellbeing of their families.
I agree with Xenia that private education sometimes gives children an advantage, an unfair advantage.
My dd will be sitting grammar school entrance exams next year.
I will be pointing out to her that she will be competing with children who have been taught in classes of 15 for the past 6 years, and who have had a lot of extra money spent on private tuition in addition to their private school fees.
I want her to know that the children who get into these schools are not necessarily any cleverer than she is, or harder working - they have just had educational advantages that she hasn't had, and that therefore she shouldn't feel bad if she doesn't get one of the very tiny number of places on offer.
I think it's good for children to understand that we don't live in a meritocracy and that the children of rich people are much more likely to be successful and rich themselves than the children of poor people - no matter what their actual potential or IQ.