Gaming is about reward. And it's a really basic reward loop at that. The rules of conditioning seem to indicate it shouldn't be this easy to get hooked on a game. I mean, yes, the random-reward, random-interval has the best return on investment. But how did I generalize the concept of reward to 'game score'.
Actually, I'm half lieing to myself there. The reward is that every time I do something worth a point, my name scrolls up the status area.
usually accompanied by
You killed AnonymousOtherPlayer
And that's a point.
That and ducking what should be a "killed situation".