It's very difficult for many African Americans and minorities to take a leap and not take big salaries. It's difficult if you don't have a significant other who generates a lot of income or a family with financial backing. All the funding is chasing after the same five deals. The deals that get funded tend to be from the established players. Andreessen can get it in a heartbeat because he's a proven commodity.
Venture capitalists give money because they like the person.
One of biggest reasons people invest in a company is because they believe in the founder or management team, because they've done something great in this field before. That's why you see people do one, two, or five ventures. It's easier once you have a track record with the venture capitalists. They know you have the drive and the skills. They're going to chase after you first.