Make well written and thoughtful replay

A post having no replies doesn't necessarily mean it's a bad post or that it got zero attention. I often find the best posts are difficult to respond to with anything but "good post".

I'm not sure I replay OP correctly.

good post

...

good post

If your reply really is thoughtful then people will nod and move on without needing to comment saying "I agree."

I agree.

I agree.

The bad side of this tacit "convention" is that it can apply to retarded posts that people with a small amount of knowledge can dismiss out of hand, but newfags can believe it's true if no one disagree.
So we're doomed to answer and refute every stupid post, even the most obnoxious bait…

There's no problem if you only reply to interesting bait user!