I wrote this in my other comment but figure'd I share it here to:

In my eyes, the advantage of micro bots is they have a lot less people bidding on them and they have lower minimum bid requirements. For someone that has no money to spare and is just getting started on Steemit, they may be able to help get that tiny little ball rolling and get the snowball effect going.

Having that one extra upvote, a little bit of earnings, and a comment on a minnow's post may be enough to get a potential reader to click in!