The reason why the can get paid as much as they want is 100% based on you being able to jump ship form company to company without having to wait for a company to find common ground between you and them through a union.

How strange, were I live there are Unions but when I jump ship I get paid what I want, without waiting for the Union, what do you think a Union is for ?

The real power of a Union is to let workers to negotiate for a minimum wage level (for example, I cannot be employed for less than a certain wage because it would be illegal to do so) that are reasonable and some basic rights the workers have (for example, no at will employment, a minimum PTO days which are enforced and thing like this).

True, this has some consequences, mainly companies try to go for the legal minimum, but I would say that it is positive overall