Whilst that's true, a lot of the games don't last very long, most of them don't last anywhere near 9 minutes, my games usually last 2-4 minutes, if the one team loses very quickly it can take as little as 30 seconds. The problem with increasing payout is the good players would get such a huge amount of credits from it. I'll be logging the lengths of games soon, so that might help give us some insight.