> If people who hold conspiracy theories put down money and lost
If people who say that the government claim on X is true had to put money behind it, we'd see a massive wealth transfer from smirking status quo guys to little groups of conspiracy theorists. Half the time (like for example the missile strike on that family of saints as we left Afghanistan), the government line has been disproved before the press release even gets out; easy money.
edit: if anything, Predictit acts as a summary of current media coverage/sentiment.