I think it's just numbers. There are maybe a few dozen people that see your post on /new. That's a tiny sample size, not a good proxy for how interesting the post is. You see this on Reddit as well where the same exact post gets 1 upvotes and then finally blows up.

Chasing clout through these forums is ill advised. I think people should post, sure. But don't read into the response too much. People don't really care. From my experience, even if you get an insanely good response, it's short lived, people think its cool. For me it never resulted in any conversions or continued use. It's cheap to upvote. I found the only way to build interest in your product is organic, 1 on 1 communication, real engagement in user forums, etc.