One difficulty with the suggestion for "Home Node Posting, plus signature pointer" is that it encourages trivial posting.
I have been a member since March of 2004, and a reader before that, but I only have 52 writeups, and a large portion of those were this week.
My skill level puts me in a position where I really don't have a lot to add to most discussions. I am skilled enough where I am not asking a lot of questions, but not so skilled that I can contribute a great deal to the answers.
If I were to have my sig line as the only way to encourage people to see my job posting, I might have a tendency to post excessively. I am not saying that I would, but it would be a temptation.