I understand your skepticism, but look at the current model. You have recruiters representing candidates and companies, yet they are only financially motivated by whether a transaction happens (whether or not that is in the best interest of the job seeker). If you don't bother with recruiters, you certainly wouldn't bother with an agent. But I'm surprised you quickly dismiss a concept where you would have true representation. If you feel you can go it alone and don't need the help, more power to you. Some people change their own oil and mow their own lawns too, and some don't. Personal preference.

You could argue all recruiters are opportunists to some degree. But if I do my job and do it well, someone gets a job they want and a company grows. It's a win win (except for the company that loses the employee).