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That's how it works dude. Did you expect it to stay on the front page forever?

No, but I did not expect to go from 28 to 650 in about an hour.

Karma is weird. You spend an hour agonising over the composition of a well-written comment and get down-voted.

Or maybe, you write a quick throwaway one-line comment, and upvotes instantly increase your karma by 50.

I have also found this to be surprisingly true.