But many high earners have not worked their way up, or have come from higher income families and therefore even if they did start out on a lower income, they have often had family support and do not have the experience that people who come from poverty and still live in poverty do. I understand that is not always the case, but choice of profession and the kinds of options that somebody considers are highly influenced by class and class is highly correlated with education level and income. I know people like to pretend we are all classless now, but realistically in the main, people are creatures of habit and we do what we know.
I don't think anybody really thinks that any income level (well maybe Jeff Bezos) completely removes all limitations, but there is a certain level at which the general struggle to survive is lifted and I think that's what people on the higher income end don't really get, and it can be frustrating if you're on a lower income to see people say "Well you see we need to make choices too" - the thing is, those choices aren't "put the heating on or buy the kids new shoes" but "eat out or get a newer car" "holiday vs private school".
If you can easily cover all your essentials and the financial choices you are making are between luxuries, then that is a whole league, a whole world away from robbing Peter to pay Paul, carefully timing your direct debits because a dip would be disastrous, making compromises because you can't afford something you really need, being generally stressed and worried about money all of the time. It takes a toll on health which also affects earning potential.
It's not that people on lower incomes think people on high incomes have limitless money, but the concept of having all the essentials covered and being able to choose between luxuries feels limitless in comparison to that kind of existence. I'm sure it doesn't feel limitless when you are used to it, especially when there is always somebody who can afford more, but that is the feeling that people are trying to get across.