Why would a black be wanting to be a member of a private all-white club?
Augusta is not an all-white club. The first black member joined in 1990. It is an invitation-only club, so it simply took until a black was in the circle of friends of the current members for one to be invited.
It does classify itself as a 'single genger' club, however. So, males only. And, even thought they call the annual membership low (<$10,000 annually), the members are typically very, very rich.
The membership list, updated as of 2004, is here.