If a post has a higher potential reward, it will appear on trending/hot thus more people will be able to see it. If they open it and comment that is their decision. From personal experience, I get more comments on posts that are shorter than on the longer ones since there's not so much content people have to read, so it's easier for them.

If a post is of quality and it gets hit by a curator but it still has only a few votes does your system still applies to it? It's an interesting idea but it's too automated, there are many more factors to be taken into consideration.

I think that the only solutions are an organized team/community who can deal with the flagging.