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Well if you rarely have dust it can be one of the following reasons

  1. Your vote is 0.02
  2. If 1 is not true then after you have voted , somebody else has voted
  3. They have dustsweeper enabled.

Posted Using LeoFinance Beta

I just checked my votes that are 7 days old, I can pretty much eliminate 1. and 2. , you can see the main chunk of my votes on Not-a-Lottery comments.

So my guess is 3. but what is dustsweeper?

Well dustsweeper is like , you send some Hive to it and whenever your comment gets an upvote which is less than 0.02$ the dustsweeper bots comes in on 5th or 6th day and upvote it to push it above 0.02$ so that you don't miss the payout or in words it prevents it from becoming dust.

Posted Using LeoFinance Beta