Putting this in the simplest terms possible, there are three elements to how retained recruiters earn a fee:
1) Build a ‘call list’ of potential candidates through research or their existing network, database or running ads (e.g. Careerbuilder)
2) Select from the pool those candidates who fit their clients’ requirements
3) Convince those who qualify to look at the role
Some recruiters offer more services: writing ad copy, writing job descriptions; having assessments performed, managing the scheduling of interviews, etc.
Notice that none of these items include finding you a job. So set your expectation accordingly when networking with a recruiter.