In some areas, whites can buy black. For instance, our company uses a black-owned company to wire our phones, computer connections, etc. We also use black-owned companies for some of our other on-site services. I am white, and everybody else in the company, except one, is Iranian-American.
So why do we buy black? Simple. With all the discrimination that still goes on, a successful black-owned company in some fields gets where it is because it really is better than just about everyone else. That has been borne out by our experience too.
To us, its not really about race. The black-owned companies we have hired outperformed every other company we ever used in those fields. We simply want the best.