I think you're conflating some issues here.
I agree there is a huge issue in the UK regarding generational wealth versus income, with income having risen so far below the rate if asset price inflation for decades, and being taxed more highly, resulting in lower living standards and the opposite of a meritocracy in that it is now difficult even for highly qualified professionals to afford a decent family home and normal lifestyle when people with the same job roles a generation or two ago would have had large houses, wonderful holidays, probably a holiday home, children in private schools. This is the result of national decline, economic mismanagement in terms of industrial and international trade strategy, and idiotic tax policies, all sadly perpetuated by both major UK political parties as we saw yesterday again, very disappointingly. But that is another thread...
Yes, there will always be higher and lower earners, of course. My point was that this is one factor out of many that contribute to whether someone is an attractive prospect to the opposite sex. Some of them are interrelated and correlated and wealth/ income is correlated highly to a lot of others so it's understandable I suppose that many people (even subconsciously) use it to filter for people in their range, appropriate and realistic partners with whom a relationship might work because they are reasonably similar so more likely to have similar values, prospects, lifestyles and be compatible. That's not to say of course that someone might be very poor and have outstanding qualities in all other aspects which outweigh this.
Many intelligent people have few qualifications. Many bright and intelligent people end up not having successful careers/ businesses. Many rich people die young, and many poor people live long lives. Many poor people end up fabulously wealthy. Many people might have perfectly lovely personalities yet have not found a partner because there's some other problem in their life that prevented them doing so. There are always outliers and people generally judge people as they find them.
My point was that at a population level, when we look at the averages, it is not surprising that wealthy people are more desireable as partners than poor people given that wealth is highly correlated to health, stability if life, higher IQs, fewer social problems, lower levels of crime, higher levels of education, higher levels of career success, lower levels of relationship breakdown, longer life expectancy. More attractive people earn more on average, also.
It wasn't a judgement on anybody's individual choice of romantic partner. I was pointing out that it's not surprising that it's easier to find a partner if you are wealthier because at a population level it also means that you're much more likely to have those other desireable characteristics as well. Which factors are causal of each other is another debate again! But the correlation of lots of these factors with wealth is well-documented, hence unsurprising that wealthy people on average have a larger dating pool as they are likely to also possess many other desireable qualities as well, and that very low earners aren't a very attractive prospect on average because not only would they struggle to support 50% of the costs of raising a child but also have a much higher likelihood of having many other undesireable characteristics as well, from an evoluntionary point of view.
Obviously there will be exceptions, but in many cases I doubt that these low earning men could not find a woman prepared to have a family with them simply because of their earnings, and they were the perfect partner in every other way. Most likely, there are other "co-morbid" correlating factors that also made them a bad prospect as a partner and the correlation between the low earnings and not having children is being mistaken for causation, when it is probably more likely that there are other factors that are the actual cause of both their low earnings and unsuccessful personal relationships.
Your DH proves my point: his lower earnings alone were not a barrier because he had other attractive qualities that compensated. These complaining men need to have a long think about the real reasons women are rejecting them AND they are unsuccessful in their careers and maybe address why that has happened...