This is an important issue and thanks for writing to clarify it.
I always thought the dust threshold was $0.030... which is why I have been reward commenters on my blogs with at least 3 cents.
@dustsweeper are doing valuable work!
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i thought it is 0.025 but that number is said probably because of price fluctuation and that vote something (where it goes down with time :D, i am a noob :D ) so you don't vote just 0.020 and after few days it is below it.
this 0.020 i found on dustsweeper article, i did not do any other researcher