In regards to the "above average" suggestion, most likely an author's "replies" to other posts would be much less valuable, but her "blogs" would be more valuable, so a strategy for bots would be: up-vote "blogs", ignore "replies".
Another example: an author is good at writing "funny" posts but not good at writing "serious" posts, so bots vote for her "funny" posts and ignore "serious" posts.
My 2 cents.
That would be correct curation and would add value.