The change I'd make is simpler, just change the betting to guessing the round score. There'd be a hell of a lot more upsets that way.
That's not a bad shout. How has Salty not turned this into a massive money-spinner yet? The possibilities seem endless: hooking underage kids on grey-area gambling, whilst simultaneously luring in the once-virgin adult populace into a lifetime of addiction.
I'd imagine that the second this dude starts making real money off this, every company in the world will come knocking with a cease-and-desist order. Mad copyright infringement with all the unlicensed characters and music.