I'm going to guess that "whatevers left" may not be the permanent policy. If it starts to sell well (which sounds unlikely from the comments so far) they will most likely cap it. they are there to make money and will not give unlimited seats away for 20% of their face value. Even selling them at TKTS brings in more money.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.