I think putting a maximum amount on votes would work. The only bot I use is a charity bot - @treeplanter - and the maximum amount they will double is 0.1 SBD. If you send them more than that, you don't get a bigger upvote, you just donated to plant more trees. And the bot can only vote a post once. It's not going to put anyone on trending, but it's fundraising and a way for us small fish to give a special upvote extra when by ourselves we can't vote much. That kind of bot, I think is cool.