It's not just about the money. It's time too or better lack of time. I don't have enough time for voting manually for the most of the time. Definitely not for downvoting.
The other issue is the quality. In my opinion it's completely irrelevant. We have all different perspectives.
I known you'll bring in plagiarism but to search for that is even more time consuming.
Don't ask me about solutions though.
I don't have any.

But I agree on Steem Power. It's a holy grail of steem blockchain, for sure.