What happens when support subsequently changes after the 50% support is reached? Coins change hands, opinions change and suddenly something that had 50% support last week doesn't this week. This week being an excellent example since apparently 200K+ coins have apparently changed hands.
That's an issue with this CLAMour thing. It's possible to buy votes, in the form of CLAMs. You need 500k CLAMs or so to get 50% support for your petition, so maybe for a million dollars you could get your petition some attention.
That's an issue, but not the issue I raised.