That's a good point, and I like your proposal, but we post on other job boards and don't currently lose much time sifting through obviously bad candidates. So,

That's a good point, and I like your proposal, but we post on other job boards and don't currently lose much time sifting through obviously bad candidates. So, even without any such mechanism, I think that the benefits of improved interactions with HN members would outweigh the extra costs.