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I've also noticed this and would like to know more. I feel like this didn't happen on HN 5 years ago, but it does now.

I always wondered if maybe it keeps track of who has voted on your submissions in the past, and only gives you karma if the voter hasn't voted on you before.

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Not sure whether it's influenced by your existing karma. My perception (with sample size of one) is that when my karma was lower I accrued at closer to 1:1, whereas now definitely not accruing at 1:1.

Same with me. However, rules may have changed over time and I am only slowly accruing karma.

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