Raise the bet limit for the arena
That way you can bet more money, and if you lose, it hurts more, but if you win; the winnings get divided by all the winners equally, with 10% going to the winner of the fight. For instance,
dourht
Krillik
Gideon
bet that chavez is gonna tool on chieg
they all bet 3k
so the pot is 9k
but someone, terra, bets on chieg to win, she bets 4k
miraculously Chieg wins
terra gets 11.5k, chieg gets 1.5k and the 3 losers get squat.
I suggest a 5k betting limit.