Perhaps it's just the system in Australia, but since the unemployment services were 'doled' out to private indiustry a few years ago, here in Aus it has gone mad. Recruiters place non-exitent jobs online in an attempt to get more subscriptions, or people registered to their lists, this provides them with government funding based on the registrations of people looking for work (and more bonuses tacked on if those people have a disability). I submitted my resume to over 25 jobs in a 2 month period, one response indicating I was not suitable for that single position, which i argued but got nowhere with, the others got no response. The agencies also are known for simply duplicating jobs listed elsewhere (from news papers etc) so they can (try) to collect their fees doing the placements on the businesses behalf, without their request.
So in summary, ensuring the recruiters are posting jobs with valid information is the best thing to do to ensure that the applicants are getting a good service.