Now may be the right time because prices seem to have significantly softened, particularly up through lower mid grade. Of course, you never know; they could soften even more from here.
Actually, besides the CC auction in December which had multiple copies (too close in grade IMO) in various grades and with poor eye appeal and page quality which set some low GPA prices, the book seems to have been doing well. I've sold a 5.0 and a 5.5 (former 6.0) for strong money. I'd say just like with all books, the eye appeal, PQ and auction fatigue all play a factor in auction prices.