Doesn't that depend on who is doing the seeking? If the employer seeks you, then you have the upper hand in the negotiation. If you are just seeking a job, then the employer will probably just offer the going rate.
Most of us in here don't need collective bargaining, that just creates another middle man with his hands in your wallet. But like AMI pointed out in another thread it doesn't hurt to know what the market rate is for your position, when you get to the point in the hiring process of discussing salary.