I don't really know how things will play out yet. The point here is just that there is behavior we want to encourage and behavior we want to discourage and I'm hoping we can work together using the new tools available to do that.

More specifically to your scenario - the bots are not the only ones who can downvote things. It only takes a relatively small downvote to wipe out the profits made from a significant amount of purchased upvotes, it's not 1-to-1 since the profit from buying votes is typically 10-20% at most.