You also need to factor in that Recruitment Agencies prefer to place people in work, so they can "churn" someone in the vacancy created by the departing employee, it is a wonder ANYONE without a job can actually get a job.
It isn't that much of a conspiracy. In my experience Recruitment is very much a bums on seats enterprise, the recruiter doesn't care whether or not the person is in a job, they really do (the good ones) put the hard sell into why they think a particular person is right for the role. Truth is they don't care, they just want to close the deal for that particular vacancy.