I wonder if the reason why those posts were overlooked was because people couldn't quickly decide whether they want to spend more time reading more text. Put it a different way, the number of comments is a function of text length (among other things), and there might be a particular text length threshold that would maximize number of comments.

If a lot of people use this tool and comment on previously overlooked posts, the number of comments will even out (because the passion score will drop), and maybe we will get better variety of posts.