Post count well...I guess they could challenge the top posters. 
They can only try, and fail. Ok anyways, I think there is a problem with necros too. (The act of bumping up a really old thread with a new post) there have been a growing amount if necrowers these days, bumping up old threads that are from the start of 2014 or older.
I don't think posting a large number of posts in a day is intrusive, as I post a lot here, (595 posts!) as long as those posts have meaning and help the community. However, spamming rubbish should not be allowed.