Sorry for a long post, but I don't think this is a simple problem.
The number of sports people who earn huge amounts is tiny, yet they are always dragged into discussions about inequality. I wonder if it's because football, along with 'celebrity' is a way for people with very humble roots to earn lots of money, and people resent it. A footballer (or an 'influencer') is not playing by the rules of middle class success, and is working outside of their cultural norms.
We pretend that we live in a meritocracy, and that this is why some people are on the breadline and others 'deserve' to earn sums that would lift large numbers of others out of that. Some occupations are given higher status than others, with financial rewards to reflect that, but if we deconstruct the reasoning it really doesn't hold up. 'Hard work' is impossible to define, but we can measure hours, stress, competitive edge, and so on, and when we do that it becomes less easy to argue that any of the things we use to explain someone's merit is particular to that occupation.
Yes, successful professionals often put in long hours. So do security guards, for a tiny fraction of the pay. Yes, there are stresses associated with areas such as finance, but nobody is going to bash a banker over the head to get at a safe, and that is a real risk for a security guard, and is undeniably stressful. Yes, entrepreneurs have to have an eye for what sells, and how to maximise opportunities, but 'influencers' do that too - their work is every bit as dependent on their last video as an entrepreneur's depends on his or her last deal. Yes, a top surgeon has to have talent, but so does a footballer. And so on.
So we come to the old argument that it is down to market forces, and that anyone can work in a shop or on a production line, but only very few can operate on our bodies or brains (for example). This is very true, but this is where the meritocracy argument falls down - we (as a society) deliberately limit high levels of education to a chosen few, and deny access to more people the further up the qualifications ladder they want to go.
Someone whose mother is a surgeon is far more likely to go to a school with a strong 'success ethos' than the daughter of a shop worker, for instance. They are, therefore, much more likely to get good exam results (pretty much regardless of ability) and therefore move up the education ladder. They will get on a medical course much more easily, as their parents will be able to help with filling in forms that are deliberately designed to be exclusive. A factory worker's son will be hampered there, even if he has the same A level scores, which were significantly more difficult for him to achieve.
For those who overcome that hurdle there is the issue of 'fitting in' both at university and in the workplace. We see even on here how many people still go on about their grammar school, or 'good' university when they left them decades ago. The UK is a snobbish society which places a lot of store on which educational establishments people attend, probably because access to prestigious ones has been limited and protected since the abolition of state grammar schools. So just by saying that you went to CLC and Cambridge you have the advantage over someone going to Bash Street Comp and Grottytown Poly.
Then there is the cost of an education. Yes, loans mean that nothing is paid up front, which means that parents don't have to fork out, but rents for student accommodation are very high, and living expenses mean that without parental support, poorer students have to work as well as study - a level playing field?
Some professions are very hard to break into unless you have connections. Getting a place in Chambers is one example, but there are others. Interestingly, when printers and typesetters behaved in a similar way, it was considered 'restrictive', but that's by the way.
I won't go on further, but there are many other possible examples. I really don't think that we live in anything close to a meritocracy, and without that to prop up prejudice it gets more difficult to look down on or blame others for not doing as well as we have.
Cultural norms, as mentioned earlier play a big part, but so does access to role models. I can't remember the figures now, but recently read that 'a lot' of people don't know anyone who could sign a passport application for instance. They know nobody in a professional or paraprofessional role, so how will they find out about the range of jobs and careers that are possible, or think that they could do that?
When people are living at a subsistence level the norm is often to have more children, as they provide a support network, emotionally and practically. Children give a purpose to a life that may lack it, and in cultures where people rarely move more than a few streets away, families can offer support in older age, babysitting, pooled resources and so on. If you don't expect to have to pay for education, and don't value cultural experiences there is less incentive to think about what you 'can afford' for your children. As long as they can be fed, housed and clothed until they have their own children, that's what matters. When the goalposts move, and housing, food and fuel shoot up in price, then of course that is exposed as a risky strategy, but it does explain why the middle class norm of deferring gratification and limiting spending to what can be afforded doesn't apply. If you can't afford anything, what's the point?