Took a different tack on upvote buying using two bidbots - 5 SBD each.
Before @smartsteem
After
Say 5 votes and $2.15 after % SBD at $1.13 per SBD
Then after @postpromoter
Say 15 votes and $2.50 return (after 5 SBD at $1.13)
Basically both bots produced the same positive result though one does not post a comment. A posted comment does allow one to upvote the comment but it also tells other readers that one used a bidbot. It is easy to find if one does but it takes looking for. I did not gain any followers from getting on the trending page.