[sblock=OOC]I have to admit, had I considered this more critically, I'd probably have decided that the entire betting scheme they devised should be rewritten. I don't want to 'hide the ball' and I don't want to spend more time on this than it deserves.
Aside from Tirra's 'offer,' no bookies take bets on anything except the next day's bouts. Why? I dunno. They wrote it that way. I think that was, partly at least, to stop the PCs from getting filthy rich if you were able to bet on the whole thing. (If you could bet on the whole thing now, without having the odds adjust as you win, you guys could potentially clear WAY more cash than would be reasonable.)
Depending upon how well you guys perform (including winning bouts, but also things like landing critical hits) a fictional "rank" will go up. As your rank goes up, the suspected odds of you winning increase, and wagers in your favor become less profitable. It is possible (though not VERY likely) that, if you make it to the final bout, payouts on bets for you to win could be as crappy as 1:10.
As noted, in considering this more, it probably doesn't make a great deal of sense, but I don't know that I want to take the effort to fix it.[/sblock]