So....... what your saying is basically a 10-man spar with half hp and balloons are just for visual?
:0 maybe an event more similar to Mario Kart's Coin Battle would be interesting?
Gralats are placed on battle field; at beginning, players race to get gralats. During a 3min battle, 1hit = drop 1gralat. (not exactly "drop" but gralat is subtracted from opponents wallet and added to your wallet. because its too easy to just turn around and get it back) a end of 3min, you keep the money you earn. (person who leaves with the most money gets an extra prize?)