I'm against it. Since you automatically get your last bet if you don't change, it means we've all picked. Knowing someone has bet or not gives the late betters an advantage. True, this can be mitigated by being able to change one's bet, but I'd rather make my pick and wait for the next round. And not start playing a bunch of oneupsmenship with the people that want to work the system when I've already bet and they know my last bet's amount.