A pro believer in upvote bots. I appreciate the help you are providing. To me there are so many ways to earn on steemit which will only allow the community to grow. To limit the system per say as in not allowing the sale of upvotes would essentially reduce traffic on the site.
In regards to bots trying to help more I think they are doing what they think is best for the community and themselves. So rather than asking bots to raise more SP it should be end users task to figure out when it is best to use the specific bot.
people are still bidding on a losing bot. There is already a tool to track the bid bots to make sure you do not bid on a bot that already went over or equal its voting value.
Even without that tool you can see if that bot is performing or giving a good return with the chrome or firefox extension "steemit more info". Then stop using that bot if not returning good.