They bargain their rights because they're eager for a shot at money. It is very hard breakout without one, if that's your goal.

It's incredible that you can say this and not understand that this is exactly why the relationship is coercive and gets abused.

Plenty of horrible things are legal; that is not the measure of what is good. Our entire economic system exists to benefit those with money. It's always been that way. Can you guess who it was that decided we should have a political system that gives power to people based on how much money they have? It wasn't poor people. Capitalism inherently drives towards monopolies.