If it was me, I'd take the negative feedback any day of the week!
Personally I wouldn't give negative feedback if I'd bought one and he didn't supply it, though. He made a stupid mistake ... doesn't mean he should lose thousands of dollars.
If he sells something he can't or won't supply...
Why would you leave anything but negative FB?
People leave - FB here if you don't post things in a Bubble Mailer (Regardless of the condition it turns up in!!)
He wants to get greedy and list pre sales... He falls on his own sword!!