Adding an extra layer to the sales process that will be handling the entire sales process should cost you no additional time at all - actually, the inverse is what they are proposing. The services I provide to my clients as a recruiter save them quite a bit of time - bringing them opportunities saves them research time, fixing up their resumes when necessary, scheduling interviews, negotiating, etc. All I do is save my candidates time, and that service is free to them. If I negotiate a higher rate than they would have negotiated on their own, even better. As an agent, I would be compensated based on two things - my ability to get you more money (higher rate, low amount of downtime) and save you time.