I agree, the way OP is using voting isn't really what it's intended for and the "mark read on scroll" is a better option for what they want.
However, what damage are they doing? They are basically giving encouragement to everyone to keep posting. If the worry is bandwidth, Piefed is only at ~5k and the threadiverse at ~40k. If bandwidth is a problem now, how will the platform scale to 400k or 4M active users?
I would upvote your and Nusm's comments, because they contribute to the discussion, but I already hit my limit for the day (took under an hour). If you want more of my perspective. OpenStars and Squirrel also provide their viewpoint on the situation in the post (I don't know how to specifically link to my comments so you got a link to someone who replied to me).