Yes.
@Jazzepi Giant lawyers say : Biding was stated to be "in gold" not in chads or copper pieces.
More seriously, a last minute +1 when WL which seemed motivated and made several serious offers was probably not online was rather evil. I would have accepted it only to respect the word of my rules, when I forgot to give a minimum increment. But with the .5 to give me an excuse to ignore the offer, I prefer to do so...