Having openings posted looks good to venture capitalists, which is, more and more, the way to succeed in our economy. This has secondary effects of teaching pe

Having openings posted looks good to venture capitalists, which is, more and more, the way to succeed in our economy. This has secondary effects of teaching people that having open positions is good just for the sake of it. They don't stop to analyze why they think that. While the workers might be busy there are managers or HR people who want to appear busy, and job postings is a thing they can do. It also feels good to see a bunch of applicants and feel like you're in a position of power while sorting through them--and of some actual work comes along you can just ignore the applicants. In short, there's no reason not to post a ghost job.