My assumption would be the companies that know, rely on developers to be their recruiters and the ones that don't and use headhunters look at developers as reso

My assumption would be the companies that know, rely on developers to be their recruiters and the ones that don't and use headhunters look at developers as resources and are OK with the churn until they find a cog that fits the machine. I don't think second rate organizations would even see the value in a good recruiter.