Ah, OK, now I get you ;-) An interesting hypothesis, I honestly don't know whether that would work. The biggest problem then is that there is a large percentage of HNers who see downvoting as a legitimate way of showing disagreement. One of them happens to be dang, so you would have some convincing to do...

(While I don't subscribe to their view, they do have some arguments in their favour. And what is more, this is an issue that gets debated at least once a month on HN, so good luck trying to push the balance :D )