That has to be one of the worst excuses for backing out of a purchase. He would have been better off just saying he changed his mind. Really that is just being greedy and obnoxious. He wants his first choice of books and any discounts applied later.
No doubt. That's a new one on me. I don't think I've seen that before. I've seen all manner of self-entitled, navel-gazing, "my mommy says I'm special so the rules don't apply to me" type of behavior on this board, but this one is new.
And I've had a seller offer me books, responding to a WTB post I made, that were priced 40% higher than his prices in a sales thread he had currently running at the time.
He did manage to blame it on his wife. So he had that going for him.