No, on principle. Sorry.
I'm worth what I'm worth. I'm worth whatever I am able to negotiate with my employer on the free market. We may not always agree, but that's the cold hard truth.
I'm in the process of negotiating a compensation package with a new company. The ball is in my court. I'm skilled, and I'm really good at what I do. I'm looking out for my best interest, and the company is looking out for theirs. They want to be as profitable as possible, and I want to get paid as much as possible. They need me, and I (kinda) need them. We meet somewhere in the middle. That's how it works.
No one is capable of negotiating on my behalf better than me. It's my life, and I'm responsible for it. My compensation package is mine and mine only, and I'm not going to trust something that important to a third party.
I do not belong to any one company. My skills and talents are mine, and mine alone. I rent my time to employers. For 8 (or so) hours a day, 5 days or so a week, I provide them with something they need and they pay me for it. If either one of us is unsatisfied with the arrangement, we part ways.
I just don't have the union mindset, and I never will. I'm opposed to the whole idea on a very deep level. Freedom works both ways. My employer doesn't owe me a job, and I don't owe them my time. We work for each other's benefit. If my company doesn't want to pay me what I think I'm worth, then that's their right. It's their company, not mine. If they pay under market rate, then I will have no problem finding work elsewhere. If nobody wants to pay me what I think I'm worth, then I guess I wasn't actually worth that much now, was I?