What I think might help in an escalating spoils game is to have a "Next incriment" number. Yes, you could scroll through the log to find out who cashed in the last set of spoils and for how many troops.
However, I feel that this would be nice for those who don't want to - or more then likely, don't have the time to - do this when they're deciding on cashing in a set, especially if they're planning on doing so before the mandatory 5-spoil limit.