The problem with mark-read on vote is that people downvote new posts simply because they don't personally find it interesting.
There aren't as many users on here so two downvotes might hide the new post entirely from quite a lot of users. There's no karma system or super complex algorithm but downvoting does affect the visibilty of posts
They are a meddling bunch - I keep throwing them out but this generation of apprentices just browse the magiscroll all day, don't listen, and don't have manners.
They always think they are doing me favours by breaking into my study and "cleaning up" my perfectly organized piles.