This assumption of stealing from the rewards pool needs to be addressed, there is no stealing going on. That SP is being delegated to earn a reward on investment, if it were not 'sold' do you think it would be used to vote on what people regard good content. No, what would happen then is they would be forced to write posts and self vote to earn the reward. The problem with Steemit is not the bid-bots but that the curation rewards are not geared to forcing people to go out and vote for good content or any content for that matter. I hope the addition of communities may help in that regard, but since the vast majority of users here have little or no SP the curation reward system as it stands is clearly not working and that is what needs to be addressed.
Most of this stems from the fact that Steem distribution is very very concentrated towards a few at the top with the vast majority having little or no SP at all and the current set up isn't helping to distribute that SP more evenly, fix that and you will fix the problem.
Also this notion that only good content deserves to be highly paid is false as well, I think at best you will hopefully end up with the majority of highly regarded content being well paid but there is always going to be some bit of crap that will make it to the top if it is well liked. That's why you can't ban a one picture post with just one sentence, what if that was the most important picture ever taken and it just needed to be posted and shared, you couldn't judge that on substance alone.