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I think the article is missing something visual to demonstrate the actual scoring at work.

I've made a simple plot in Excel here: http://i.imgur.com/adjaLQ9.png

The number of up-votes remains the same, while down-votes increases linearly. The scoring declining line in grey is the score.

Here's a 3d graph showing this as a function of upvotes and downvotes. I think it's clearest with

x: [0, 100] y: [0, 100] z: [0, 1]

Label the axises please.