It is part of their service to assess the position available in comparison not only to the market of qualified candidates, but also to the positions of other clients who are competing for the same type of candidate. If the position, experience required, salary range, etc. are inconsistent with what the market will yield, they have an obligation not only to inform employers of that, but to help them come to a conclusion as to what criteria would be more appropriate. The selection process without the use of a professional recruiter, can average twelve weeks. Recruitment companies can cut this to four weeks to conclusion. Because of their reputation and success, they are constantly interviewing and screening quality candidates.
Agencies can identify candidates faster than employers can for themselves.
It is, after all, their specialist subject. You have just accepted a great new job with a new employer. However, upon resigning, your current boss asks you to stay and has made you a counteroffer. Surveys show that eight out of ten employees who accept counteroffers don't complete the following year with their employer. Because the factors that caused you to seek or entertain a better offer are likely to remain in force.