I have provided a couple of possible solutions to the bid bots before - including changes to front ends so that users can remove the effect of bots from their experience and also a possibility of having Steemit inc. use their vote power to create 'official' vote selling, where the cost of the vote goes into the reward pool or is burned. I think these are better alternatives than adjusting curation/author splits - but what happens in the real world is not always in line with expectations!