Why rich black people won't help poor black people is actually not that perplexing. It has to do with power structure. A long time ago, when black people got rich, there was a deeper connection to black populated locations. It made sense, because black people got rich off of other black people. Deeper powers didn't like this because it empowered too many blacks that would normally be disadvantaged. That would soon change.
In the end, whites found that it would be less empowering if black people did not get rich off of other black people. Now think about it, if white people contribute to the lifestyle and success of black people, then these black people would not have a deep need or desire to empower black people who were disadvantaged.
The way the structure works is not so puzzling. White people make more black millionaires than black people do. It's a numbers game and it is played well. However, played very strategically. This concentrates an idea in many black people's minds that the money is where the white people are. This has been transcended and passed down for ages.
When black people open up business' they find it easier to attract and sell to white people than black people. It is known throughout black America that many blacks are conditioned not to buy from black people. Black people do not find a need to shop at black stores or support black business'. Again, this is strategic.
These days, even in hip hop culture, the main consumers or the music are white people. Again, marketing and numbers game. Black people don't help black people because they don't feel a need to. That's why it is so important that black people learn to someday support black business' and communities. It's the only way that black people will ever be able to progress, especially in America.