I am sympathetic to what you are saying, but most fighters, period, end up broke. Part of it is because they were ripped off, or they are poor managers of money. The person who broke this cycle in boxing was Muhammed Ali. Before that, people who made it was because they started a business, like Dempsey. Jack Johnson, one of the most underrated boxers of the modern error retired when he was 53, because he was poor.
Most fighters, however, never made much money.
People on Sherdog do not realize that fighters, even the low scale ones, make more money than the majority of fighters. Most fighters cannot make a living doing what they love. What Rocky went through is what the life of most fighters, historically.