I value this book between $400-$500k because of the label notes and I also think that right now, WW is a bigger character in the DC Universe than Green Arrow with just the movie and with more to come later on in the future. WW is gaining a lot of steam and is a top 3 DC Superhero in my opinion. If the owner is having health problems, debt, or what have you, and seems like he is in need of cash, than why not just auction the book instead of sitting on it with a buy it now price and wait who knows how long? If it is for a huge flip he is trying to accomplish, than I understand why he would have it as such. It's still a key book and a very nice looking copy and I project it to do well at auction. Probably a better time to sell the book during the MF 73 crazy price hike a couple years back or so. If I had the book, I would've tried to auction it then, now it seems prices are going back down to earth.
Whenever I see a GA book with minor amount of color touch, glue etc., I always think of it as not being intentionally that it was probably caused by accident. If small enough it probably wouldn't affect the grade, but I would approach on the side of caution and figure it would drop a couple points or even half a grade. But yes, rather risky to try and do a press and to regrade the book. We've all seen books placed in blue holders suddenly turn up in purple holders after a re-grade. It can happen...