The full breakdown of prizes per win has been revealed:
http://i.imgur.com/KRsdNzk.jpgArena - Hearthstone: Heroes of Warcraft Wiki
Together we can figure out the average value the HTB for everyone.
In this example, we will use a pool of 8,192 people playing in the HTB, but this math is scalable to any amount of entries.
Of our 8,192 players, this will be the prize breakdown.
Wins Percent Actual Prizes in Gold* Total Prize**
0 Wins 12.5% 1024 players 100 Gold Won 102,400
1 Wins 18.75% 1536 players 200 Gold Won 307,200
2 Wins 18.75% 1536 players 300 Gold Won 460,800
3 Wins 15.63% 1280 players 640 Gold Won 819,200
4 Wins 11.72% 960 players 880 Gold Won 844,800
5 Wins 8.20% 672 players 1040 Gold Won 696,880
6 Wins 5.47% 448 players 1200 Gold Won 537,600
7 Wins 3.52% 288 players 1360 Gold Won 391,680
8 Wins 2.20% 180 players 1520 Gold Won 273,600
9 Wins 1.34% 110 players 2400 Gold Won 264,000
10 Wins 0.81% 66 players 4000 Gold Won 264,000
11 Wins 0.48% 39 players 5760 Gold Won 224,640
12 Wins 0.65% 53 players 12000 Gold Won 636,000
*Dust is converted to gold at a 1:1 ratio, given a pack costs 100 gold and on average gives 100 dust. Golden legendaries are counted as 1,600 dust/gold.
So based on this we have 8,192 people paying 1,000 gold each to enter HTB.
Total Amount of Entry Cost: 8,192,000 Gold
**Extrapolating from the table above we can figure out the total prizes paid out. (Total players * gold won)
Total Amount of Prizes Paid: 5,822,800 Gold
Final Breakdown
For every 8,192 people who play HTB blizzard collects 8,192,000 gold (or dollars) and pays out 5,867,600 gold for
A NET LOSS OF 2,369,200 GOLD PER 8,192 PEOPLE --- OR 289 GOLD PER PERSON
TLDR; Heroic Tavern Brawl is a scam (or lottery ticket if you want to be generous), on average everyone will lose gold.
(For you gamblers out there HTB has a 28.9% rake, usually a 10% rake is considered high, so this is just robbery.)