I'm not saying that it's broken. My point is that the way all the user interfaces round the numbers up can be quite misleading, as I stated in my first comment (when trying to upvote a comment to get it above the dust threshold, for example). The three decimal places feature in SteemWorld gives us a better idea of our upvote value, but rounding is still there.

So, it seems the easiest way to find out our "unrounded" upvote value is still to multiply our SP by 1,000 then divide the resulting simulated upvote value by 1,000, because no interface shows the value without rounding it up.