IMO the round multiplier is too high. x5 xp is really nice when you get it, but rather over the top imo. I'd like to see base gold upped slightly and the following done: make the multiplier increase by .75 (or thereabouts) each time you win. So first time is x1, win and you get x1.75, win again and you get x2.5, win again and you get x3.25, et cetra. This would tone down the massive win bonus a bit but still give a lot of incentive to win.
I've also heard people ask for it to cap at x3, which might be a good idea too. What does the community think?