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It works much the same as democracy. If you don't participate, you're giving up your primary means to influence how things are.
I certainly hope so. Moving to a union-represented company has increased my pay by 25%, and got me full medical benefits. I only pay $50 a month for my union dues. >

Union dues seem to be the biggest argument I hear from my family about why unions don't work. You're literally making more money than what the dues cost in just a couple of hours at best and you're getting more benefits from your job than before... and job protections.
But nooooo, unions are bad!! We don't need them in this era!! /s for good measure, but that's what I hear from the fam and they're being dead serious. >

A better one is "my union is corrupt/does nothing/waste of due money". Then when you ask if they've ever voted, attended a meeting, contacted their rep, it's an obvious "no". 
Like jeez, maybe if they attended a meeting they'd see what their dues are being spent on and what their union is doing.