Interesting timing because I am working on a service that does exactly this. Essentially I will be your agent. Tell me the job you want and your salary and I still get it for you. Help you schedule, cleanup your resume etc... in return I get 10% of your paycheck for a year. I am currently beta testing it with a handful of people but if interested email me at eibrahim@gmail.com
Moreover, 10% from me is quite different than a fee paid by the employer. The employer fee does not necessarily have to come from my pocket, as payscales could be standardized or deduced and negotiated. But the 10% definitely would cost me.
I'm not trying to be rude or decline your help. Just giving feedback on your business model.