Originally Posted by Blizzard Entertainment
About Those Invites
Invites to the Guild will (at least initially) only be available for purchase on the Black Market Auction House. We’ve taken this approach both to control queue times, and also because the Brawler’s Guild is meant to be kind of a small, underground thing, and a way for players on a realm to come together. At first, that will happen because invites will go out from one player to another based on who buys those initial Black Market invites. After reaching a certain rank in the Brawler’s Guild, each of the new members can eventually earn one new invitation of their own to pass out to someone else on the same realm, so the Brawler’s Guilds on each realm should get progressively larger and larger over time. We may also investigate alternate methods of acquiring invitations or making them more plentiful.