In the beginning I had started doing this, buy votes from bots. At first the returns were great but then I started getting negative returns and stopped for about a month. I recently picked it up again because of the high returns that you mentioned. FYI I have this link as a favorite and always on it when I am on steemit. I basically look for the best deals for an upvote in highest ROI and it changes all the time. Good luck.
https://s3.amazonaws.com/yabapmatt/bottracker/bottracker.html
Thanks for sharing your thoughts!