I'm guessing it is a gambling system where you probably duel people for coins. Depending on how confident or whatnot you are, you can bet an amount and you can also challenge people to odds of winning. (1:1 though 1:5 odds) After you run out of money you become a loser, but someone else can buy you out, perhaps by paying your debt (although I think that would be too hard to do) so probably they just pay a standard fee to free someone.

One thing I'm not sure about is what happens to money once it is deposited.