My personal opinion is that the "stop posting Mahalo stories" comments aren't any better than yours, but apparently other people here feel differently. That's just the way it is.

If you feel that it's an important conversation though, then there are several things you can (and should) do rather than just post "Thanks." (1) Vote up the top-level HN post so that more people will read it. (2) Respond to comments complaining about seeing this conversation repeatedly on HN with your analysis of why you feel it's important. Then you're adding something useful.