nonquixote

Your copy might not be worth pressing, but square bound books can be pressed. In fact a good pressing can help with staple bumps that might already be there. The trick is to press with a flat surface sandwiched under the front and back covers. Also, be careful not to put pressure directly on the spine since it can cause it to become rounded. I leave the spine protruding over the edge of the press about 1/16 of an inch or so, just enough to prevent it getting squashed.

If your primary concern is selling it, even though it's probably not a 9.8 it's in nice enough shape that slabbing it should increase sales value significantly more than the cost to grade it. If you can't wait 3 months or more to sell it, you will still get a decent price for that book raw, probably in the $250-300 range based on recent ebay sales.

Wear on spine corners, long color break upper right front cover, foxing on back cover makes it a 7.0 at best for me.

Could be a 9.8 and I'd only submit it as a 9.8 prescreen. Probably not cost effective to slab it at any lower grade.

A press would help with the corner bend, but there are enough small color breaks; upper right corner, right edge by Bane's elbow, spine ticks, etc, that the best you can hope for after a press in my opinion would be around a 9.0-9.2.

Definitely worth grading. I had one of these graded 9.2 which i sold a few months ago for $800, it would fetch more now. Yours might be in a similar or higher grade. Better pictures would help with that assessment.

3.5. 

There are a lot of defects that are basically invisible without close inspection (finger prints, finger bends, slight waviness, tiny spine ticks, etc.) that will detract from the final grade. Moderate flaws more so than slight ones, and the more that are present the lower the grade will be. They all add up and WILL be seen by the grader. There are a lot of 8.0+ books that on first glance look almost indistinguishable from 9.8s.

I don't read comics anymore. I started collecting in the 1970's, and loved the stories. Now though, panel by panel storytelling doesn't do anything for me. I still appreciate the cover art, the nostalgia factor, and the value of my books, but I'm no longer a comic reader, and prefer novels.

8.5-9.0 for me.

A clean and press could help this book a lot. Looks like a bit of spine roll which can be fixed and might help with the looseness. I think it could be 8.5 or so after pressing.

5.0 for me.

I think it's no better than a 6.0. As a general rule restoration does little to raise value unless it's a really rare classic book such as Action Comics #1 in really bad shape. To make it more presentable you can press it yourself using a clothes iron, some backer boards, and some parchment paper. Look up some YouTube videos on that before trying it. Be careful not to set the iron's temperature too high, somewhere around the wool setting or medium should be OK. With your book in its current condition you are unlikely to do much harm as long as you don't scorch it, and you can at least flatten out the edges and smooth any waviness that way.