Actually race is a good predictor for achievement and self support. What ever made you think it wasn't? Is there any reasonably large data set anywhere, for anything besides sports and entertainment, that doesn't show blacks perform worse on average?
Race is an EXCELLENT predictor of opportunity and achievement but only because graphing it along with a racial profile of economic power owned by the average Joe is a mirror image.
Economic Power is the deciding factor, with education being its leverage, in predicting opportunity and achievement - the matching race graph is merely a coincidence, given our history.
No, other way around.
The No. 1 predictor of someone's wealth is intelligence. Race and intelligence are tightly correlated.
Consider this: IQ predicts for wealth, regardless of race. Thus, smart blacks are richer than dumber whites.
Smart whites are richer than dumb blacks.
And in general, because whites are smarter than blacks, they're also generally richer.
If that were true, there would be no black doctors or professors. If that were true, the darker the skin, the more likely a man would be incapable of learning. If that were true there wouldn't be the steady stream of stupid, uneducated, poor white folk sitting at my desk on a daily basis crying about their circumstances.
The evidence my own eyes have witnessed during my fifty years on this planet does NOT support your theory.