From one point of view this program was created to make all votes count. No matter how small value, it’s not fair that the system destroys it. The other side was to actually preserve value, to prevent that $0.015 will never be paid out.
I’m not sure the 0.0005 threshold is a good and balanced one. But for sure, going lower we will void point 2 above as we won’t preserve any significant value. Someone might also complain that we are only spending the VP to boosts dustsweepers curation rewards and build SP.
The counterargument to that would be that the stronger that Dustsweeper is, the more everyone benefits in the long term.
I guess the other argument for upvoting microdust is from an onboarding perpective. With RCs being as restrictive as they are for new, small accounts, it could be disheartening and disengaging for a newcomer to use that RC to cast a vote for an encouraging comment that someone has made on their post, only to see that vote disappear into the ether.
Personally it doesn't phase me either way, but I'm just putting up an alternate viewpoint for consideration.
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The onboarding perspective would be the reason to change the threshold. 15SP is delegated by Steemit to new accounts, but around 25SP is currently needed to reach $0.0005. So from that point of view, it would make sense to lower the threshold.
Maybe we should make a dPoll about this and let all the users choose.
Three options: