Jimbo_707 - "For the record, I would never cash someone's check and not ship a book." Good to know you do have SOME ethical boundaries.
"Also, if ghosting means abandining the boards, I obviously haven't ghosted." No, I was saying you refuse all PMs and that means you ghosted. I see you still do not allow PMs. How does anyone who is not hiding act like that?
"I also haven't sold the book." By any ethical, decent, civil, and legal code of conduct, you have. Now you may not deliver the book, but I don't think there is a single person here who does not think a transaction has occurred whereby you sold me the book.
Did you get a better offer after the sale and that is what made you feel like it was worth more? Your actions have been super-shady and it sounds like your reason is simply what we all feared.