How much does a recruiter make on me?

PGY4 resident getting ready to sign contract in Ohio with SDG. I'm now getting ads from "St Johns Associates" for this job. Anyone have a rough estimation of how much the SDG will save by not going through the recruiter to get me? Is using the recruiter a sign that they are desperate and therefore I can negotiate more?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums