You have very mixed up views about Professional fighting. Especially considering your statement about "if you're struggling to pay the bills, go wait tables." Clearly you're one who does this mainly for hobby.
The people born into fighting always have distinct advantages. It's in their blood, but Wrestlers who were born into Wrestling are a bit different. Wrestling beyond Olympic competition becomes what? Either MMA or Pro Wrestling, which Pro Wrestling is a slightly different standard. In this day and age fighting to be the best is a good motivation to get you to become the best, but what about once you are? Again, very few people who were born with silver spoons up their asses know how to carry themselves as Champions.
No one who is hoping to become a Pro fighter is going to go wait tables if they're struggling to pay bills. That's just stupid. They want to become Professional so they do not HAVE TO do shit like that anymore. I've washed dishes for a living, laid brick, delivered food, all kinds of crap. I have other talents aside from fighting, but none that anyone who could pay me enough to support my family cares about. So I chose to fight. Why? Because when I talk about swinging my fists THEN everyone pays attention. I don't have to win any favor, all I have to do is impose my will on another man.
Have you ever looked into the eyes of an opponent and seen that as he looks at you he's picturing everything he never had? Everything he was told he never would be. All of the people who have told him that. His children. Every single member of his family who has either succeeded or failed before him? I guarantee you this guy will be as tough as if not moreso than anyone who was born with all the advantages. Because this guy will do whatever it takes because in his mind, it means his continued existence. It means food, it means clothing, it means a home. This is the life of a fighter. Wether he's a journeyman Boxer who becomes nothing more than a "could-have-been" who is now a Professional loser (paid to fight people who promoters KNOW he will not defeat, but that he'll put up a good fight against), to World Champions of any fight sport.
No one fights just because. And if they do, they're usually quickly forgotten. Lineage is a good motivator, but I've never seen it compare to utter desire to live and breathe. Some of us, take this that seriously.