Pay it !
While I agree this place is just one endless bend over and take it in the a** parade, I would tell you, just pay it.
Life is bizarre, and you just never know when you might end up transiting through this place, or be on a flight that gets diverted or god only knows. And then you will be straight to jail, no questions asked, and it is not a pleasant time, I have seen it happen.
50 bucks is nothing in the big picture of life.
Pay it, move on. Enjoy your escape .