...it doesn't matter what he has in his possession to get wealthy; being rich is being rich, ...
the bank do not accept you to pay your debt with whatever you possess, then you aren't rich. If your name aren't on the forbes youngest list, you are too not rich.
It's kind of funny on your level of thinking @ O.P, because must all the rich people in this world be on the Forbes list? Because one thing you just need to understand is that if a man is rich he is rich, it doesn't matter where he wishes to store his asset weather in fiat, Bitcoin or gold, in as much as he could have access to it for spending whenever he wishes to.
What forbes does is to compare the names of the worlds most richest people, and not mere regular rich men. Or are you trying to insinuate that our famous player "Christiana Ronaldo" is not a rich man? Because I couldn't find his name among Forbes most richest men in the world in the link provided below.
https://www.forbes.com/billionaires/
...marry solely based on their partner's financial status?...
yes, it is happy ending! happy ending is about you fantasizing about having a stable job, and you drive home to your sweet home, where your wife would welcome you with cooked meal and clean house, and you have two kids, one boy and one girl greeting you.
I bet you that marrying just for financial needs do not provide a happy ending in a marriage, as there are many other factors that contribute to a happy ending in any relationship or marriage, such as effective communication, trust & tolerance.