Hacker News is actually quite good at containing the `spam'. E.g. this discussion is limited to the comment section of one article.

HN is good at containing spam, but only because it constantly polices for it. I shouldn't have been so rude about it in my opening comment on the thread, and I know that's why I'm being downvoted to oblivion, but I really do think this was a lame spam submission. I'm disappointed and a little dismayed that other people seem to disagree - I'd really hate for this site to pop up on corporate radars as a place they could drop FREE iPad! job offers without getting called out as completely lame for it.

I did not find Red Gates offer too bad. But I understand that you fear that it might lead onto a slippery slope.

I guess you should just flag the submission, if you feel it's bad for HN.