Truth be told the reason I tried DustSweeper was because I thought it did exactly just like that.

Months ago I used to get a decent amount of comments on my blog posts to which I always make sure to upvote above the dust threshold. This means I have to upvote most of the time around 50% which is ery costly, my thought was just I could upvote them at 10% and let dustsweeper do the rest. Well turns out it doesn't work that way.

So yeah I for one would pay for a service like that.