It pays on day 6 because the idea is to only vote on posts with rewards below the Dust Level, i.e. no author reward. This actually insures that the author gets paid. If it paid earlier, it would potentially waste a vote on a post which someone else would vote up over the Dust Thresh-hold during days 1-5.
dustsweeper like bots give vote on 6th day which means author earns nothing if I am not wrong. they should come on atleast 2nd or 3rd day.
It pays on day 6 because the idea is to only vote on posts with rewards below the Dust Level, i.e. no author reward. This actually insures that the author gets paid. If it paid earlier, it would potentially waste a vote on a post which someone else would vote up over the Dust Thresh-hold during days 1-5.