NOTE: Your challenge card is never consumed when this is done correctly, so the entrance fee will just be buying that one card.
NOTE: It is currently working on live-horde servers, I do not have an alliance character to test this with.
NOTE: I am testing this with a character who's fully completed brawlers guild rank 10/10, which might be bugging it.
NOTE: Current gold/hr is very variable as the bags are random. If I can find a way to force you to fight 'special cards' only the gold/hr can be variable between as it stands now at normal cards, your gold can vary between 2-3k/HR (as long as you can pull decent DPS and win)
EDIT: Until I can find a way to glitch the special cards, it's remaining at 2-3k+ with only 1-2 other people queuing.
Album Link for proof ----- http://imgur.com/a/xAcyS
As you can see from the pic.. it is literally IMPOSSIBLE for a rank 10 to queue, let alone against dippy without a challenge card, and considering my only challenge card is being shown as bruce.
There's currently a bug with the brawlers guild, in order to do this bug you:
A) Must have access to Brawler's Guild.
B) Must have multiple Brawler Guild Challenge Cards.
C) Must have access to a cross realm zone outside of your servers normal CRZ. EX: Illidan CRZ'd into Tichondrius
Normally when you complete a brawlers guild fight you will receive a one-time brawler's purse with 10-100g (and special-fights worth 100g x rank requirement on card) plus miscellaneous items in the bag worth up to 10-150g each.
To do this bug, there are two methods I've been able to do.
100% Success-Rate
Step 1) Get an invite to a cross-realm zone other than yours, EX: If you're on Darkspear get an invite to Sargeras Cross-Realm.
Step 2) Buy a Challenge Card, it doesn't matter which one, the fights seem to be completely randomized. (atleast I can't force it to do the 700g challenge cards, boo)
Step 3) Queue with your challenge card, then immediately leave your cross-realm zone back to the original server. If you get put inside the arena before you zone back, you will NOT get loot.
Step 4) Beat the randomized boss you get, and he will give you a brawlers purse. (if boss is the same as your card, no money will be awarded.)
75% Success-Rate
Step 1) Buy a Challenge Card
Step 2) Queue with your challenge card
Step 3) Get an invite to a cross-realm zone other than your own. (has to be before you get inside arena)
Step 4) Beat the boss (if you get the same boss as your card, you will NOT recieve any money.)
I'm currently working on a way to force this glitch into only letting you fight the rank 7 special fights (consistant way to get a minimum of 700g/fight)
EDIT: If anyone's curious as to how I keep getting multiple cross-realm invites, I'm using OQ to get on waitlists for random things then leaving after I queue.
EDIT: You must zone to a different area before you get teleported inside the arena or this will NOT work; the act of zoning inside brawl'gar's arena will refund you the challenge card as it believes you disconnected totally, and didn't even start. You will still remain in-queue, the boss you get is completely unknown though.
EDIT: Currently looks like this is a HORDE only bug, if any ALLIANCE can make this work, please post below.
EDIT: Cards correspond to a particular set of bosses each. (ex: Special Card: Splat yields the opportunity to fight Ahroo'Ru, rank 9 end boss, whilst Challenge Card: Bruce yields the hardest boss as Fjoll) I do not have a complete list for this, but it seems to be less random than originally thought.
Disclaimer: Yes, this is method is entirely determined on your queue time. If you have 10+ people queuing brawlers guild, you OBVIOUSLY won't have the same gold\hr that I had when I tried it with 1-2 people queuing.
From personal runs, first run I made about 2750G, then second hour I made around 1750G. The gold\hr can be variable. RNG is RNG.