No, its not the same for everyone. But, then, life isn't fair. Sometimes it is who you know and not necessarily what you know.
But, if you work yourself as hard as you can, you will get some measure of success. My brother recently got an enormously lucrative job offer. Same parents, same upbringing, etc. He is vastly more wealthy now than I am, and I would have said, I do pretty well. We both work hard, but we work differently.
He has been able, largely because of his personality, to just doggedly persue opportunities. I have shied away from some and have not been willing to take the personal or financial risks he has. I prefer to spend more time at home with my family, he travels all week almost every week and only comes home on the weekends. He gets the first class flights for work travel and is moving now in the right circles to give him those kinds of opportunities you talked about. But, he did work his tail off to get there, but how and what he did was different than how or what I did. We are still both successful though.
I will not ever have his level of success. That is OK. But, I have my level of success and I have gotten the piece of the financial pie that I am happy with. Sure, I would always like a bigger slice, who wouldn't? But, you can't compare the actual physical work and say someone is working harder.
Yes, maybe they are - but WHAT did they do to advance? Did they go to college? Spend nights and weekends networking? Did they study for every promotion possible? Did they look at other career paths and opportunities? I would bet you that guy doing shipping did work his ass off - BUT - he was also pretty complacent. He said, this is "good enough" I am not going to try to advance anymore. And, when you give up like that, its on you.
As far as the "why" Do I ever think about it. I don't have to. I do it for me, for my family and to provide the absolute best that I think I am capable of for my family. I don't do it because I like the work, or that is how I want to spend my time, or because its the path of least resistence, which is how so many people end up in dead end jobs. I do it because I want to build wealth. Period. I want to get as big of a slice of that pie as I possibly can. I won't get a slice as big as some. But, I will do what I have to do to get it.
connie