After what he did to Tom and what you are going through, the number of faithful has dwindled considerably.
Yes, a "completed" amp would tempt people. Still, they would be stupid to give him money until the amp was provably shipped. You shouldn't do it either. Wait until Monday.
The only real rule on HC is don't be an asshat. So you can't be an asshat, at least not for long.
Don't forget the potential criminal charges if you try to intimidate him, especially physically. All he has to do is not allow you into his office or home and you are stuck. If you force your way in, it's trespassing.
Dan is doing the right thing. If he ends up paying and the amp doesn't show, he'll have basis for a fraud charge. It's much better to on the "no criminal charge" side of this argument.
Maybe he was just building up (padding) his feedback.