It appears that there is still lot of confusion when it comes to using voting bots to increase your post rewards . It is often the case that people are overbidding and therefore causing loss of money for all participants in voting round .
@yabapmatt created tool that helps you avoid that . https://steembottracker.com/
'Max Suggested Bid' column tells you exactly if voting bot is already filled or there is still some room for bidding . Use it to avoid any potential loss .