Half the time there is no client... They are just luring you in, and once they have your resume, it gets spammed out to as many employers as the have in their address book. Your resume gets used as "bait" in order for them to find new clients.

Even at DeveloperAuction we get clueless recruiters pitching us Java Engineers in NYC (We're rails in SF) and sending us "blinded" resumes with personally identifiable contact details removed. It's craziness!