For every dollar that you plug into a slot machine, on average, the casino is going to skim a few cents and give you back the rest. "Looser" slots keep fewer cents out of each dollar -- but they always keep something. But the casino doesn't care about that, because they know one thing as surely as they know that the sun will rise in the morning: Eventually, they will get all your money.
If you've ever spent time at the one-armed bandits (or watched someone else) you know the psychology. As long as there's still coin in your pocket, you can't walk away. You rationalize: "What if I leave now -- just before it hits big? It's gotta pay sometime; it's long overdue. It owes me. Do I want to walk away and leave the jackpot for the next person?" And so it goes.
And so it goes in Iraq. Only it turns out we've run out of